TVT in Dogs in India: The Contagious Tumour of Free-Ranging Dogs and Its Vincristine Cure

Signs of Transmissible venereal tumour

The 10 signs to watch for are listed below. Any one of them is a reason to consult your nearby vet; none of them is a diagnosis.

• A cauliflower-like, fleshy red growth on the vulva, vagina, penis or prepuce
• Blood dripping from the genitals outside a heat cycle
• Blood spots on the floor that look like blood in the urine
• Constant licking of the genital area
• A foul-smelling discharge from the genital region
• Straining or discomfort when passing urine
• In a male, a penis that will not retract into the prepuce
• Nosebleed from one nostril, or a growth on the nose or face
• A bleeding lump on the skin, lip, gum or eyelid
• An enlarged lymph node near the affected area

Breeds on this site that document this condition

Transmissible venereal tumour is not inherited and not breed-linked, so no breed carries a genetic risk of it and no screening scheme exists anywhere. What raises risk is behaviour and free-ranging status, meaning an entire dog that roams and mates. The cards below therefore report each breed's share of one hospital case series with its denominator, never a breed predisposition, and that same series found mixed-breed dogs at roughly seven times the odds of purebred dogs.

What TVT in dogs actually is, and why it is not an ordinary cancer

TVT in dogs is a contagious cancer, which means the tumour is not made of the dog's own cells at all. It is a single cancer cell line that first emerged in a dog that lived about 6,000 years ago, and every TVT tumour on earth today carries the DNA of that one founder dog. The MSD Veterinary Manual puts the same fact in clinical language, that canine TVTs share strong cytogenetic identity and represent a cell lineage that has been continuously propagated for several thousand years, and that the tumour cell is itself the infective agent.

That makes it the oldest cancer known in nature. It also makes it almost unique. The only other known examples of transmissible cancer in higher animals are the Tasmanian devil facial tumour and the contagious reticulum cell sarcoma of hamsters, so a dog in Chennai with a genital growth is carrying a biological rarity that most human oncologists will never see.

The genetics have been read in detail. A time-resolved phylogeny built from 546 TVT exomes traced the lineage's worldwide expansion, found a highly context-specific mutational process that operated early in the cancer's evolution and then vanished, and showed that neutral genetic drift, rather than ongoing positive selection, is the dominant feature of its long-term evolution. A 2025 follow-up found something stranger still, a 15-megabase genetic element built from 11 fragments of six chromosomes that entered an Asian sublineage of the tumour around 2,000 years ago, taken from a dog whose ancestry is associated with the ancient Middle East.

Where it lives, and why India is on that list

TVT's distribution follows free-roaming dogs rather than climate or breed. A global survey that collected 645 completed questionnaires from veterinarians and animal health workers in 109 countries confirmed the disease endemic in at least 90 countries, and found that the presence of free-roaming dogs was associated with higher prevalence while spaying and neutering were associated with lower prevalence. The same survey traced 317 published case reports running from 1810, when the disease was noted in London as one of only two cancers then known to afflict dogs.

India is not a minor entry on that map. The MSD Veterinary Manual states plainly that TVT is the most common canine tumour in the Bahamas, Japan and India, and the chapter is written by an Indian author, Bhaskar Ganguly of Indian Immunologicals Limited. An Indian journal paper puts a range on that claim, reporting that in India TVT is the most frequently reported tumour in dogs at 23 to 43 percent of all canine tumours, attributing the figures to two older Indian surveys without reprinting their denominators.

The reason is arithmetic rather than anything about Indian dogs. India counted 15,309,355 street dogs in the 20th Livestock Census of 2019, down from 17,138,349 in 2012, as the Minister of Fisheries, Animal Husbandry and Dairying told the Lok Sabha on 2 August 2022. A cancer that travels by mating in an entire, roaming population has fifteen million hosts to travel through. Our guide to stray dogs in India carries the population numbers and the law; this page is the disease that population carries.

How TVT spreads between dogs, and which dogs actually get it

TVT spreads by the physical transfer of living cancer cells from one dog to another, usually during mating, and also by licking, sniffing and parturition. There is no virus and no bacterium in the chain. The MSD Veterinary Manual adds that the tumour can be naturally transplanted only across abraded mucosae, that a certain quorum of cells has to transfer for it to take, and that dam-to-pup transmission can happen through grooming.

Four routes put an Indian dog at risk, and only one of them is mating.

• Mating with an infected dog, which is the commonest route and the reason an entire, roaming dog is the classic patient.
• Sniffing or licking another dog's tumour, which is how the nasal, oral and eye forms arrive.
• Biting or scratching, since the cells only need broken mucosa or abraded skin to establish.
• A bitch grooming her pups, the one route that reaches an animal too young to mate.

The dog that gets it is defined by lifestyle, not by pedigree. VCA describes TVT as most commonly observed in mixed-breed dogs, in dogs that are sexually intact, and in stray and free-roaming dogs, and the numbers behind that sentence are stark. At a Brazilian veterinary teaching hospital that saw 60,256 canine patients between 2012 and 2022, mixed-breed dogs carried 6.95 times the odds of developing TVT compared with purebred dogs (95 percent confidence interval 4.8 to 10.1), working out at roughly 60.3 cases per 10,000 mixed-breed dogs against 8.7 per 10,000 purebred dogs.

What an Indian free-ranging population actually shows

The best Indian denominator comes from a sterilisation programme rather than a cancer study. Between 4 July 2013 and 13 December 2016, a catch-neuter-vaccinate-release programme in Jamshedpur, Jharkhand took 20,915 free-roaming dogs into its clinic across ten sites, and recorded TVT on visible examination at intake. Adult dogs had a 3.44 percent probability of arriving with TVT (95 percent confidence interval 3.11 to 3.77) against 0.23 percent for puppies (0.13 to 0.33), an odds ratio of 16.24. Female dogs ran 1.99 percent (1.65 to 2.36) against 0.82 percent (0.63 to 0.99) for males.

The most useful finding in that paper is what happened over time. The probability of a dog arriving at the clinic with TVT fell significantly with each year of the programme, an odds ratio of 0.85 a year (95 percent confidence interval 0.77 to 0.94), which the authors attribute to fewer intact dogs mating less often. Our guide to dog sterilisation in India covers the operation itself; this is what it does to a disease at population scale.

Does it favour females? Three populations, three answers

Sources disagree about sex, and the disagreement is worth printing rather than resolving. The global questionnaire found no universal gender bias at all, with 144 respondents saying TVT was more common in males, 146 saying females and 168 saying equally common, a chi-squared p value of 0.907. Jamshedpur's free-roaming dogs gave females roughly two and a half times the odds of males. The Brazilian hospital series was 61.1 percent female, 80 of 131. A one-year diagnostic-centre study in Astana, Kazakhstan went the other way, with 73.9 percent of its 23 confirmed cases in males.

Read together, those four say the same practical thing. Sex is not the risk factor; being entire and free-ranging is, and which sex shows up more depends on whether you are counting street dogs or owned pets. The Jamshedpur authors give the mechanism directly, that males are sexually receptive all year and one infected male often mates with several females.

What you see first, and the two things it gets mistaken for

You usually see blood before you see a tumour. TVT masses are cauliflower-like, pedunculated, nodular or multilobulated, range from a nodule of a few millimetres to a mass of more than 10 centimetres, are firm but friable, and the surface is often ulcerated, inflamed and bleeds easily. Because the mass can sit deep inside the prepuce or the vagina, the first thing an owner notices is often blood spots on the floor.

That is where the two classic mistakes happen. The MSD Veterinary Manual warns that blood spots from a deep-seated genital TVT lead to misdiagnosis when the bleeding is wrongly assumed to be haematuria, blood in the urine, or epistaxis from some other cause. In males, a deep-seated TVT often shows up instead as paraphimosis, a penis that will not retract. An Indian rescue worker sees the same picture from the other side, with vosd.in noting that TVT is frequently identified by caregivers who notice unexplained genital bleeding in a community dog during routine feeding. The symptoms of TVT an owner reports are therefore almost always bleeding, licking and straining rather than a lump they have seen, because the mass itself is often out of sight.

Where on the body the tumour sits, with the numbers

Genital is the rule and everything else is the exception, but the exception is not rare. In the Brazilian series of 131 dogs, genital involvement was present in 87 percent (114 of 131), and 77.9 percent (102 of 131) had genital lesions only. Extragenital TVT occurred in 22.1 percent (29 of 131), and 13 percent (17 of 131) had no genital tumour at all. Those are the dogs a vet can miss.

The nasal form has an Indian case series of its own. The Indian Journal of Veterinary Pathology published four dogs in 2025 that arrived with unilateral epistaxis, bleeding from one nostril, and respiratory distress lasting several days, in which a nasal swab cytology showed the large round cells with cytoplasmic vacuolation that define this tumour. All four recovered completely. The Brazilian series found that purebred dogs had 8.2 times the odds of the nasal form compared with mixed-breed dogs (95 percent confidence interval 1.9 to 40.7), while mixed-breed dogs had 3.2 times the odds of a genital location.

Spread beyond the local site is uncommon and worth keeping in proportion. The MSD Veterinary Manual puts metastasis at about 5 percent, most often to the regional lymph nodes, with the kidney, spleen, eye, brain, pituitary, skin and peritoneum recorded as less common destinations. Dogs with genital TVT are also at high risk of bacteriuria, a bladder infection riding along with the tumour. India has a published example of what that looks like and of what happens next. At Guru Angad Dev Veterinary and Animal Sciences University in Ludhiana, a Dalmatian bitch presented with vaginal bleeding, was diagnosed on vaginal cytology, and was then found to have nodules in the skin near the abdominal and inguinal mammary glands whose aspirate held the same cells; four weekly injections later the tumour and the nodules had gone.

Age says something too. The Brazilian dogs averaged 4.5 years at diagnosis with a range from 6 months to 14 years, and 77.2 percent (76 of 98 dogs with a known age) were six years old or younger. This is a young, active dog's disease, which is exactly what you would expect of a cancer that travels by mating.

How a vet confirms TVT, usually from one slide

To diagnose TVT, a veterinarian takes cells from the mass with a fine needle aspirate or an impression smear and reads them under a microscope, which is usually enough on its own. The cells are unmistakable, a homogeneous population of large round cells with distinctive centrally located nucleoli and multiple clear cytoplasmic vacuoles. That is why this is one of the cheapest cancers in veterinary medicine to confirm.

Histology is the surprise. The MSD Veterinary Manual records that histological examination can sometimes be inconclusive and that TVTs may be hard to tell from other round cell tumours, particularly lymphosarcoma, when they appear in extragenital sites. Cytology beats biopsy here, which reverses the usual order and is worth knowing before anyone agrees to surgery for a sample.

The Indian literature says the same thing in its own words. A study at West Bengal University of Animal and Fishery Sciences took impression smears from six mongrel bitches presented with a protruding vulval mass and blood-tinged urine, stained them with Giemsa, and confirmed the diagnosis on the punctate cytoplasmic vacuoles alone. The Kazakh series describes the same vacuoles as forming a characteristic string-of-pearls pattern.

The molecular tests, and what a karyotype gives away

Two laboratory findings settle any remaining doubt, and both are specific to this cell line. TVT cells carry a long interspersed nuclear element inserted upstream of the myc gene, which a PCR assay detects and which the manual says gives better diagnostic accuracy than cytology or histology and can help decide when to stop chemotherapy. Karyotyping shows roughly 57 to 64 chromosomes with an XO sex chromosome complement, against the 78 a normal dog carries, which is the physical signature of a cell line that stopped being a dog's own cells thousands of years ago.

That test is not academic. A young dog in Europe was found with large lung masses that clinically and histologically mimicked lymphoma, and a definitive diagnosis could not be reached despite extensive immunohistochemistry and consultation among several board-certified pathologists; TVT was only considered once someone recognised the dog's background as an imported stray from Romania, and was then confirmed by detecting the LINE-MYC rearrangement.

Where a dog came from is therefore part of the diagnosis. Los Angeles County's public health veterinarians tell clinicians to take a detailed travel history for every dog and to consider TVT in animals imported or rescued from places where it is common, naming Mexico, Central and South America, East Asia, the Middle East and parts of Africa. For an Indian reader the inverse applies: in India the travel history is the street, and the disease is local rather than imported.

Five steps make up an Indian diagnostic visit, in the order they happen.

1. Physical examination of the whole genital region, including inside the prepuce or vagina, because a deep-seated mass is missed on a cursory look.
2. Cytology from a fine needle aspirate, a swab or an impression smear, which confirms most cases by itself.
3. Biopsy and histopathology only when the cytology is not clear, and with the caveat that histology is the less reliable of the two here.
4. Blood work to check the dog is fit for chemotherapy, since the Indian trials monitored haemoglobin and platelet counts weekly through treatment.
5. A PCR assay for the LINE-myc insertion where a laboratory offers it, which is the test that separates TVT from lymphoma in a confusing extragenital case.

No screening scheme exists for this disease anywhere in the world, and none can, because TVT is contagious rather than inherited. Neither the Kennel Club of India (KCI) nor any overseas registry runs a test for it, the way hip and elbow schemes exist for the joint conditions, so a clear pedigree tells a buyer nothing about TVT risk while an entire dog that roams tells them a great deal. Indian government laboratories price every one of the diagnostic steps above, and the numbers are in the cost section below.

What treatment does, and what the response rates are with their denominators

To treat TVT, a veterinarian gives vincristine chemotherapy as a weekly intravenous injection over several sessions, and the tumour shrinks between sessions. A 2025 systematic review and meta-analysis that screened 3,633 studies and pooled the 42 that met its criteria, covering 1950 to 2023, recommends vincristine sulphate monotherapy as the first-line treatment and reports a 93.1 percent complete response rate (range 67.4 to 100 percent) after four to six weekly sessions, rising to 98.9 percent (83.3 to 100 percent) when treatment is extended to eight sessions. This page names the drug and never the amount, because how much of it your dog receives is a calculation the treating veterinarian makes for that animal on that day.

Those pooled figures are echoed by individual series with their own denominators, which is what makes them believable. At the Brazilian teaching hospital, 85 dogs were treated and an objective response was achieved in 97.6 percent (83 of 85), with complete remission in 91.8 percent (78 of 85), partial remission in 5.8 percent (5 of 85) and stable disease in 2.4 percent (2 of 85); the mean number of sessions was 4.5 and the median was 4.

India has its own trial numbers going back three decades. At the College of Veterinary Science, Punjab Agricultural University, Ludhiana, 32 affected dogs were split into three chemotherapy groups; 11 of 12 dogs in the vincristine group responded completely within three weeks, as did 11 of 12 on vinblastine, while the third group's combination took 21 to 28 days in 6 of 8 dogs. Biopsies at days 0, 3, 7 and 14 showed the tumour nuclei breaking down within three days and heavy lymphocyte infiltration by day 7.

What happens when vincristine is not enough

Resistance exists and the sequence after it is settled. The 2025 guidelines name radiation therapy, lomustine and doxorubicin as viable second-line options for vincristine-resistant cases, while noting that large cohort studies confirming them are still missing, and they place surgery third. The MSD Veterinary Manual agrees that complete surgical excision often cannot be achieved because of where these tumours sit, and that recurrence is likely after surgery alone unless radiation or chemotherapy follows. It also warns that combining vincristine with doxorubicin is more toxic without offering a therapeutic advantage, and that amino acid and antioxidant supplements may reduce vincristine's effect in aggressive cases.

That last point matters in India, where owners commonly add supplements during treatment. The Brazilian series shows what the second line achieves in practice: of the five dogs with only partial remission, three had surgical excision and two were switched to a single different drug, and every one of them then reached complete remission. Two dogs with stable disease had surgery and stayed in remission with no recurrence. One dog with a brain lesion cleared it on combined chemotherapy, confirmed by computed tomography.

Indian researchers have also tested alternatives that did not work as hoped, and that is worth publishing too. At G. B. Pant University of Agriculture and Technology, Pantnagar, working with the ICAR-Indian Veterinary Research Institute, 18 naturally affected dogs were randomised into three groups of six for oncolytic gene therapy using canine parvovirus ns1 and chicken anaemia vp3 genes injected into the tumour weekly for three weeks; the treatment arrested further progression but most of the animals underwent incomplete remission. A combination of vincristine with ivermectin in 16 bitches at Gannavaram produced significant reduction in all of them over four weekly sessions.

Can TVT be cured, and can it go away on its own? Two different questions

Yes, TVT is curable in the large majority of dogs, and the best pooled estimate is a 93.1 percent complete response after four to six weekly vincristine sessions and 98.9 percent after eight, from a meta-analysis of 42 studies spanning 1950 to 2023. No, it does not reliably go away on its own, and the two answers are not the same answer. Google's own People Also Ask box asks the cure question three different ways, so this page answers it three different ways rather than collapsing them, because a 93.1 percent response to treatment and an uncommon spontaneous regression are two separate facts.

Start with what treatment achieves. Los Angeles County's public health veterinarians write that TVT is highly treatable and that cures are often obtained, and that typically three to eight injections of vincristine are needed to obtain a cure. The Cambridge Transmissible Cancer Group puts the same thing in one line, that most dogs respond well to treatment and make a full recovery from the disease. An Indian review states that most cases are curable with three weekly intravenous injections of vincristine sulphate.

Spontaneous regression is real, and it is not a plan

Now the third question, which is where the ranking pages get vague. Spontaneous regression genuinely happens and it is genuinely well described, because TVT is the one naturally transmissible cancer that can regress at all. Regression runs in steps, beginning with a strong inflammatory response, followed by infiltration of T, NK and B cells, arrest of the tumour cell cycle and repair of the damaged tissue. Dogs that recover this way are immune to re-inoculation, which is why the disease was studied as a transplantation model for a century.

The honest qualifier is how often. In naturally occurring TVT, spontaneous regression is observed less frequently than in experimentally transplanted tumours, and the Cancer Cell team that mapped the process states flatly that spontaneous regression is uncommon. The MSD Veterinary Manual says that although spontaneous regression can occur, TVT is usually progressive and is treated accordingly. VCA goes further and calls it extremely rare. Three sources, three strengths of word, and none of them says wait and see.

Two facts explain why waiting is the wrong call. Complete regression depends on a competent immune response, and immunosuppressed dogs and puppies develop more aggressive tumours that lack infiltrating lymphocytes and are rarely eliminated. Meanwhile the dog stays infectious, so what an owner is really weighing is a rare, unpredictable recovery against certain onward transmission to every dog it meets.

There is one more wrinkle that argues for treating rather than waiting. A single dose of vincristine or a single dose of radiation is often enough to clear this cancer in a few weeks, because TVT is unusually susceptible to whatever breaks the host's tolerance of it. The Indian bitches at Kolkata showed dramatic reduction in gross tumour size seven days after the first injection.

The one thing that makes the Indian answer worse

Season changes the answer, and no owner page carries this. The MSD Veterinary Manual records that the rate of tumour regression is negatively correlated with tumour size, with older age, and with season, and that hot and humid seasons are usually associated with a poor response to treatment. Most of India is hot, humid or both for much of the year, so a dog started on treatment in a Chennai May or a Kolkata monsoon may take longer to clear than the pooled figures suggest. That is an argument for starting early rather than for waiting for cooler weather, because the tumour grows in the meantime.

Recurrence after a completed course is uncommon rather than impossible. In the Brazilian series, one dog that had been treated with a two-drug protocol recurred at eight months and reached complete remission again on the same protocol. The 2025 guidelines note that current protocols show a favourable response even in cases previously described as resistant. The prognosis for total remission on chemotherapy or radiotherapy is good, and recovery is the normal outcome, with the MSD Veterinary Manual reserving a poor outlook for the small number of dogs whose disease has reached organs beyond the skin, particularly the central nervous system and the eyes.

What TVT costs in India, from three government rate cards

TVT is one of the cheapest cancers to diagnose and treat in India, and the government veterinary institutions publish the numbers. ICAR-IVRI at Izatnagar lists a line item literally called TVT at Rs 200 for pet animals, and it appears twice on its published schedule, once under clinical laboratory investigations and once under obstetric and gynaecological services, both with effect from June 2024. Bihar Animal Sciences University at Patna prices a TVT operation for a dog or cat at Rs 1,500.

Every rupee figure on this page was divided by 84.38 and by 74 before publication and none of them is a converted dollar list; each comes from an Indian institution's own published schedule in rupees. The prices are for government teaching hospitals, so a private clinic in a metro will charge more, and these are the floor rather than the market.

The drug price is the part nobody publishes and it is the most surprising number here. Vincristine is a scheduled formulation under India's Drugs (Prices Control) Order 2013, so its price is capped by the state. The National Pharmaceutical Pricing Authority's own computation worksheet takes an average price to retailer of Rs 41.09 per ml across six qualifying packs, adds a 16 percent retailer margin to reach Rs 47.66, applies a wholesale price index reduction of 2.7105 percent with effect from 1 April 2016, and arrives at a final ceiling price of Rs 46.37 per ml, exclusive of local taxes. The eight brands it examined, from Alkem, Biochem, Celon, Cipla, Neon and United Biotech, ran from Rs 37.00 to Rs 43.62.

Put the published pieces together and a full Indian pathway at a government teaching hospital is a few hundred rupees for the visit and the slide, plus the drug and the clinic charge for each of four to eight weekly sessions Pimentel PAB, Giuliano A, Odatzoglou P. Our guide to pet insurance in India covers whether any Indian policy would pick up a course like this, and most exclude pre-existing conditions.

One Indian cost is unpublished and this page says so rather than estimating it. No Indian rate card opened on 23 September 2026 printed a price for the PCR assay that detects the LINE-myc insertion, and none priced radiotherapy for a dog. The search covered the ICAR-IVRI, Bihar Animal Sciences University and TANUVAS Madras Veterinary College schedules, all three of which do print cytology, histopathology and surgical line items, so the absence is a real gap in what Indian institutions publish rather than a failure to look Bihar Animal Sciences University, Patna Tamil Nadu Veterinary and Animal Sciences….

What is different in India: fifteen million hosts, and the law that shrinks the reservoir

India's difference is the reservoir. TVT needs a population of entire dogs that meet each other, and India counted 15,309,355 street dogs at the 20th Livestock Census of 2019. That is why the MSD Veterinary Manual names India as one of three countries where this is the most common canine tumour of all, and why the control measure it prescribes is not a drug but a programme.

The manual's control section is one sentence long and it is about population management. In areas where large stray canine populations exist, sustained animal birth control programmes together with chemotherapy of the affected dogs will control TVT cases to a great extent. The Indian review says the same, that the role of stray and wild dogs makes the disease difficult to control and necessitates sustained animal birth control in stray dogs along with prompt therapy of affected dogs.

The reservoir is not spread evenly, and the same Lok Sabha answer prints it State by State. Uttar Pradesh counted 2,059,261 street dogs in 2019, Odisha 1,734,399, Maharashtra 1,276,399, Rajasthan 1,275,596, Karnataka 1,141,173 and West Bengal 1,140,165, while Tamil Nadu counted 441,208 and Delhi is printed at 60,472 in both the 2012 and the 2019 census columns. Four States fell sharply between the two rounds, Uttar Pradesh from 4,179,245 and Andhra Pradesh from 1,237,988, while Odisha doubled. Nobody has mapped TVT against those numbers, and doing so would be the single most useful Indian study anyone could run on this disease.

India already has that programme in law. The Animal Birth Control Rules 2023, notified as G.S.R. 193(E) on 10 March 2023 under the Prevention of Cruelty to Animals Act 1960, make the local authority responsible for the deworming, immunisation and sterilisation of street animals, and make the owner responsible for the same three things in a pet animal under Rule 8(1). A V-shaped notch on the right ear marks a dog that has been through it.

The Jamshedpur evidence that it works on this disease specifically

One Indian programme has measured the effect on TVT directly, which is rare anywhere. Across 20,915 free-roaming dogs taken into a catch-neuter-vaccinate-release clinic in Jamshedpur between 2013 and 2016, the probability of a dog arriving with TVT fell significantly with each year of the intervention, an odds ratio of 0.85 per year with a 95 percent confidence interval of 0.77 to 0.94. Mange fell faster still, at 0.45 a year, while rabies and distemper showed no significant change. The authors' reasoning is direct: sterilised dogs mate less, and a cancer that travels by mating travels less.

There is a precedent for finishing the job, and it is not a tropical one. Britain eradicated TVT during the twentieth century, apparently as an unintended consequence of a series of dog management laws beginning with the Dogs Act 1871, which required dogs to be under proper control and allowed stray dogs to be detained. The 2014 global survey lists the United Kingdom, Canada, the Czech Republic, Finland, the Netherlands, New Zealand, Sweden and Switzerland as countries where every respondent reported the disease absent except in imported dogs.

What the global prevalence figures do and do not say about India

The newest global number is also the most carefully hedged, and it is worth reading in full before anyone quotes it about India. A 2026 systematic review and meta-analysis screened 380 studies and pooled 39 from 18 countries covering 1968 to 2025; 30 population studies covering 7,889,861 dogs gave a pooled prevalence of 4 percent (95 percent confidence interval 3 to 5 percent), while seven studies of dogs presented with reproductive disorders, 5,251 animals in total, gave 12 percent (7 to 18 percent). Heterogeneity was extreme at 99.5 percent, and the authors say directly that the pooled estimate should be read as a broad summary rather than a precise estimate for any given population.

Those five numbers differ by more than twentyfold and none of them is wrong. A sterilisation clinic that catches street dogs, a university hospital that sees owned pets and a pooled global average are counting three different populations, which is the single most important thing to understand before repeating any prevalence figure for India. No study we could open measured TVT prevalence in a defined Indian dog population with a stated denominator other than the Jamshedpur intake data. The searches behind that statement are recorded in the next paragraph rather than asserted.

A controlled absence, recorded. A PubMed search on 23 September 2026 for transmissible venereal tumour terms restricted to Indian author affiliation returned 8 records. Four are Cambridge-led genome studies that carry an Indian sampling collaborator's affiliation Gori K, Baez-Ortega A, Strakova, and four are Indian clinical work: a 1996 Ludhiana chemotherapy trial, a 2012 Ludhiana metastatic case report, a 2016 review from Pantnagar and Kolkata and a 2017 Pantnagar and IVRI oncolysis study. Not one of the eight is a prevalence study with an Indian denominator. The same search shape run as a control on an unrelated breed term returned 14 records, so the instrument was working. India therefore has real clinical TVT literature and, so far as these searches reach, no published Indian prevalence denominator outside the Jamshedpur intake figures.

Living with it: your dog, a community dog, and the people in the house

To live with TVT safely, do three things, which are to keep the affected dog away from other dogs until a veterinarian says the tumour has gone, to finish the full course of weekly sessions rather than stopping when the mass disappears, and to get the dog sterilised Ganguly B. Canine Transmissible Venereal…. None of those protects the humans in the house, because the humans were never at risk.

TVT does not infect people. Los Angeles County's Department of Public Health states it in one line, that TVT does not spread between any other type of animals and does not infect people. The cells are dog cells, and they establish only across abraded canine mucosa. Ordinary handling, feeding and care of an affected street dog carry no risk to the person doing it. Wash your hands after handling any bleeding wound on any animal, for the ordinary reasons.

One popular claim needs correcting, and it appears on the Indian page ranking for this query. vosd.in states that the TVT cell line can establish itself in dogs and occasionally in other canids such as foxes and jackals. The global survey that asked 645 veterinarians and animal health workers this exact question found no confirmed report of naturally occurring TVT in any wild canid, and notes that the successful transmissions into wolves, coyotes and red foxes in the literature were experimental. So a jackal is a laboratory possibility rather than something an Indian field worker has documented.

Sterilisation is the single measure that reduces risk for an individual dog and for the street it lives on. It is not a guarantee, because the tumour also moves by licking and sniffing.

One study says neutered dogs had more TVT, and it is worth reading properly

A Grenada cohort found the opposite of what you would expect, and printing it is more useful than hiding it. Among 7,180 owned dogs presented to a university veterinary hospital between 2008 and 2018, 102 dogs (1.4 percent) were diagnosed with TVT, and neutered dogs carried 2.2 times the odds of intact dogs (95 percent confidence interval 1.4 to 3.3). Local pothounds had 22.8 times the odds of purebreds and mixed-breed dogs 9.2 times, while age and sex were not significant.

That finding does not overturn the population evidence, and the reason is worth stating. A retrospective hospital record cannot tell whether a dog was neutered before or after its tumour was found, and in a place where free-roaming dogs are neutered by programmes, the neutered group is enriched with exactly the dogs that were roaming. Set against it, the Jamshedpur intervention measured the same disease falling year on year as sterilisation coverage rose, and the global survey found higher prevalence wherever most dogs are entire. Both can be true, because one is about an individual dog's record and the other is about how often dogs in a neighbourhood mate.

Five habits carry an Indian dog through a country where this cancer is endemic.

1. Check the genitals when you groom, because the first sign is usually blood rather than a visible lump.
2. Treat unexplained genital bleeding as a clinic visit within the week, not as a wound that will heal.
3. Sterilise the dog, which is the owner's own legal responsibility under Rule 8(1) of the Animal Birth Control Rules 2023.
4. Isolate an affected dog from other dogs until the veterinarian confirms the tumour has gone.
5. Finish the course, since treatment continues for about two weeks beyond the disappearance of the visible mass.

If the dog is a community dog rather than yours, the route is the local Animal Birth Control centre. Under the 2023 rules the local authority carries responsibility for sterilising and immunising street animals and may engage a recognised Animal Welfare Organisation to run the programme. Our guides to feeding community dogs in India and adopting a dog in India cover how those relationships work in practice.

TVT is not the only condition an Indian street or community dog carries, and the ones that need a same-day decision are elsewhere on this site. Our pages on rabies in dogs in India, tick fever in dogs in India and heat stroke in dogs cover the emergencies; this one is a cancer you have weeks rather than hours to act on, and which almost always ends well when you do.