Signs of prostate cancer in a dog

Updated July 19, 2017

No one knows what causes prostate cancer in dogs. While having a dog neutered can reduce the chance that a dog will develop prostate infections and/or prostate enlargement, it does not take away the risk of a dog developing prostate cancer. Even dogs that were castrated at a young age can develop canine prostate cancer. Unfortunately, the most common type of prostate cancer, carcinoma, is very invasive and it spreads aggressively. By the time the signs of prostate cancer are discovered, the cancer will usually have already spread to the lymph nodes, lungs and bones.


A dog that has prostate cancer will have changes in urination. The dog may urinate frequently and may not make it outdoors to urinate if it is an indoor dog. The dog may also seem to be in pain, or straining, when urinating. Blood in the urine is another sign of prostate cancer.

Penile Problems

A top sign of canine prostate cancer is blood or pus discharging from the penis, or if the penis drips blood or pus.

Stool Problems

A dog that has prostate cancer may have problems defecating. Constipation and straining is a sign of an enlarged prostate and prostate cancer.


Changes in the walking patterns of a dog are another sign of prostate cancer. Dogs with prostate cancer tend to take shorter steps. Their back legs may also appear stiff and rigid when they're walking.

Behaviour Changes

Canines with prostate cancer will show changes in their behaviour and personality. They may be very lethargic and un-energetic. Things that would normally excite and interest dogs may no longer get more than a glance because the dog feels too ill to explore and play.

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About the Author

Leigh Walker has been working as a writer since 1995. She serves as a ghostwriter for many online clients creating website content, e-books and newsletters. She works as a title flagger and writer for Demand Studios, primarily writing home and garden pieces for and Walker pursued an English major/psychology minor at Pellissippi State.