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Prostate Cancer in Dogs

By the Dog Health Handbook team · Updated · Fact-checked against current veterinary references (see sources)

Key takeaways

  • Neutering doesn't prevent prostate cancer in dogs, and neutered dogs may be at slightly higher risk.
  • Straining to urinate or pass stool and blood in the urine are common signs.
  • Being unable to urinate is an emergency.
  • It is usually advanced when found; about half of dogs have spread.
  • Radiation or surgery can add months in selected dogs, but incontinence is common.

Table of Contents

Research Neutering Signs Diagnosis Treatment Life expectancy FAQ Sources

Cancer Quicklinks

Summary Symptoms Lymphoma Hemangiosarcoma Mast Cell Tumors Bone Cancer Mouth Cancer Treatment Diet

Prostate cancer in dogs is uncommon, affecting well under 1 in 100 dogs, and is usually an adenocarcinoma or a urothelial (transitional cell) carcinoma.1,2 Unlike in people, neutering doesn't prevent it, and several studies found it more often in neutered males.3,4,5 Signs include straining to urinate or to pass stool, blood in the urine, and stiffness or hind-leg weakness when it spreads to bone.4,1 It is usually advanced when found. With an NSAID-class medicine and chemotherapy, survival is often about 3 to 4 months; dogs that can have radiation or surgery may live about a year or longer, though incontinence is a common side effect.6,7,8

Go to a vet right away if your dog:

  • Strains to urinate but passes little or no urine. A blocked urethra is an emergency.4

Book a vet visit if a male dog has:

  • Straining to urinate or pass stool4,1
  • Blood in the urine or painful urination1,3
  • Stiffness, a stiff back or hind-leg weakness, or weight loss4,1

See blood in dog urine and bladder cancer in dogs.

What the Research Says

  • Neutered dogs had higher odds. In a large North American database, neutered males had about 2.8 times the odds of prostate cancer of intact males.5
  • Chemotherapy helped a little. In a UK study of 67 dogs, those given chemotherapy plus an NSAID-class medicine lived a median of 106 days, versus 51 days with the NSAID alone.6
  • Radiation added months. In a 2021 study, dogs with prostate involvement treated with radiation, chemotherapy and an NSAID lived a median of 341 days, but 31% of all dogs became permanently incontinent.7
  • Spread is common. Reported spread rates range from about 16% to 80% of dogs, most often to lymph nodes and the lungs and sometimes to the spine.2,1

Does Neutering Cause Prostate Cancer?

Neutering does not prevent prostate cancer in dogs.3,4 Several studies found it more often in neutered males, but the evidence is inconsistent, and there's no clear proof that neutered dogs get more aggressive tumors.5,9,1 Because the overall risk is still low, this isn't a reason to avoid neutering. Discuss timing with your vet. See neutering a dog.1 Benign prostate enlargement, which is very common in unneutered older dogs, is a different condition.3

Signs of Prostate Cancer in Dogs

  • Straining, painful or frequent urination; blood in the urine; dribbling or incontinence1,4
  • Straining to pass stool1,6
  • Lower belly pain, fever, poor appetite or weight loss4,1
  • Stiffness, back pain or a weak, wobbly gait from spread to the spine or pelvis4

None of these signs is specific, and some dogs have no signs when it's found.1,6 Most dogs are eventually euthanized because of the tumor's local effects, such as straining to urinate or defecate.2

Diagnosis

  • Ultrasound can show a mass, calcium deposits or changes in the prostate and urethra.4
  • X-rays and CT check for spread to the lymph nodes, spine, pelvis and lungs.4,2
  • Needle sample or biopsy confirms the diagnosis. A prostatic wash often misses cancer cells.4,1
  • BRAF urine test: can detect many prostate cancers, but roughly a third may lack the mutation, so a negative test doesn't rule cancer out.10,11

Treatment Options

OptionWhat to knowTypical outcome
NSAID-class medicineThe usual starting point, as for bladder cancer6,2Median about 2 months alone6
Plus chemotherapyModest benefit6Median about 3.5 months6
Radiation with medicinesAvailable at a limited number of centers2About 11 months with prostate involvement; permanent incontinence in about 3 in 107
Surgery (prostatectomy)For selected tumors that haven't invaded the bladder8About 8 to 17 months; incontinence is common1,8
Urethral stentRelieves a blockage12Restores urine flow; incontinence is common12

Pain control is an important part of care.13 See dog cancer treatment for options and approximate costs.

Life Expectancy

Prostate cancer in dogs is usually advanced when found, and spread is the most important factor in outlook.1,6 About 4 to 6 in 10 dogs have spread by the time it's found.1,6,2 With medicines alone, survival is often a few months; with radiation or surgery in selected dogs, about a year or more.6,7,8 Your vet or oncologist can estimate your dog's outlook. When your dog can no longer urinate or pass stool comfortably, or bad days outnumber good, it may be time to talk about euthanasia. See quality of life and when to say goodbye.2

Frequently Asked Questions

How long can a dog live with prostate cancer?

Often about 2 to 4 months with medicines alone, and about a year or longer for dogs that can have radiation or surgery.

Can neutered dogs get prostate cancer?

Yes. Neutering doesn't prevent it, and neutered dogs may be at slightly higher risk.

Are dogs with prostate cancer in pain?

They can be, from straining, belly pain or spread to bone. Pain control is part of treatment.

When should I euthanize my dog with prostate cancer?

When your dog can't urinate or pass stool comfortably, pain isn't controlled, or bad days outnumber good. Your vet can help you decide.

Is there a test for prostate cancer in dogs?

A BRAF urine test can detect many cases, but a biopsy is needed to confirm it.

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Sources and further reading

This article was rewritten and fact-checked on October 29, 2026 against current veterinary references and specialist guidelines:

  1. Schrank M, Romagnoli S. Prostatic neoplasia in the intact and castrated dog: how dangerous is castration? Animals 2020;10(1):85.
  2. McLauchlan G. Prostatic: minimal invasive approach, pros and pitfalls. ECVS Annual Scientific Meeting, Hungary, 2019 (hosted by IVIS).
  3. Davidson AP. Reproductive Disorders of Male Dogs. Merck Veterinary Manual (pet owner version), reviewed June 2018, updated September 2024.
  4. Kutzler MA. Prostatic diseases in small animals. Merck Veterinary Manual, September 2025.
  5. Bryan JN, Keeler MR, Henry CJ, Bryan ME, Hahn AW, Caldwell CW. A population study of neutering status as a risk factor for canine prostate cancer. The Prostate 2007;67(11):1174-1181.
  6. Ravicini S, Baines SJ, Taylor A, Amores-Fuster I, Mason SL, Treggiari E. Outcome and prognostic factors in medically treated canine prostatic carcinomas: a multi-institutional study. Veterinary and Comparative Oncology 2018;16(4):450-458.
  7. Clerc-Renaud B, Gieger TL, LaRue SM, Nolan MW. Treatment of genitourinary carcinoma in dogs using [NSAIDs, a chemotherapy drug] and radiation therapy: a retrospective study. Journal of Veterinary Internal Medicine 2021;35:1052-1061.
  8. Iizuka K, Ishigaki K, Seki M, Nagumo T, Tamura K, Sakurai N, Terai K, Asano K. Comparison of outcomes between medical and surgical treatment in dogs with prostatic adenocarcinoma: a retrospective study. BMC Veterinary Research 2022;18.
  9. Teske E, Naan EC, van Dijk EM, van Garderen E, Schalken JA. Canine prostate carcinoma: epidemiologic evidence for an increased risk in castrated dogs. Molecular and Cellular Endocrinology 2002;197:251-255.
  10. Mochizuki H, Shapiro SG, Breen M. Detection of BRAF mutation in urine DNA as a molecular diagnostic for canine urothelial and prostatic carcinoma. PLOS ONE 2015;10(12):e0144170.
  11. Aeschlimann L, Kehl A, Guscetti F, Posthaus C, Aupperle-Lellbach H, Rottenberg S, de Brot S. Effective detection of BRAFV595E mutation in canine urothelial and prostate carcinomas using immunohistochemistry. Veterinary and Comparative Oncology 2024.
  12. Lulich JP. Evaluation of temporary urethral stents in the management of malignant and nonmalignant urethral diseases in dogs. Veterinary Sciences 2022;9(2):63.
  13. Murgia D. Managing oncology patients: hospice and palliative care. Vet Times, November 14, 2023.

About this article

Last updated : fully rewritten using the Merck Veterinary Manual, a 2020 review, a large population study, studies published 2002 to 2024 and IVIS-hosted proceedings; added the research summary, neutering facts, signs, diagnosis, treatment table, key takeaways and FAQ.

This page is for general information and is not a substitute for an exam by your veterinarian.