Understanding Prostate Cancer in Dogs

If your older male dog has been straining to pee or poop, or you’ve noticed blood in his urine, take it seriously. Prostate cancer in dogs is aggressive, it often isn’t caught until it’s advanced, and it can affect both neutered and intact male dogs, which surprises a lot of owners. Here’s what you need to know.

What is prostate cancer in dogs?

Prostatic adenocarcinoma is the most common form of prostate cancer in dogs. It’s a malignant tumor that grows from the cells lining the prostate gland, a small gland that sits just below the bladder in male dogs and plays a role in producing fluid that protects sperm.

What makes prostatic adenocarcinoma particularly serious is how it behaves. It tends to invade nearby structures early, including the urethra, bladder, and rectum, which is why urinary and bowel symptoms are often the first things owners notice. It also metastasizes (spreads to other parts of the body) relatively quickly, most commonly to the lungs, lymph nodes, and bones.

Unlike benign prostatic hyperplasia (the non-cancerous prostate enlargement common in intact older dogs), prostatic adenocarcinoma does not shrink with neutering or hormone therapy. It’s a different disease entirely, and it requires a different diagnostic and treatment approach.

How common is prostate cancer in dogs?

Prostate cancer accounts for a small fraction of all canine cancers, but it punches well above its weight in terms of severity. It’s most often seen in older dogs, typically over age 8, and certain breeds, including Doberman Pinschers and mixed-breed dogs, appear to have higher rates.

Here’s the part that trips most people up: neutering does not protect against prostate cancer in dogs. In fact, multiple large epidemiological studies have found that neutered dogs face a meaningfully higher risk, with odds ratios of approximately 2 to 4 times that of intact males. The current thinking is that testosterone may have a protective effect against malignant transformation in the prostate. Don’t assume your neutered dog is in the clear.

Symptoms of prostate cancer in dogs

The early signs of prostate cancer in dogs are easy to miss, partly because the prostate gland is inside the body and partly because symptoms often mimic other, less serious conditions. By the time most owners notice something’s wrong, the disease is already fairly advanced.

Watch for these signs, especially in older male dogs:

• Difficulty urinating: straining, dribbling, a weak stream, or going much more or less than usual
• Blood in the urine: anywhere from a pink tinge to visible red
• Straining to defecate: the enlarged prostate sits near the rectum, so bowel movements can become painful or difficult
• Ribbon-like stools: flattened or unusually shaped stool caused by pressure on the colon
• Walking stiffly or with a hunched posture: often a sign of pelvic or lower spine discomfort
• Unexplained weight loss or reduced appetite
• Lethargy or general decline in energy and enthusiasm

Signs of advanced prostate cancer in dogs may also include hind limb weakness or dragging (if the cancer has spread to the spine or nearby lymph nodes), labored breathing if the lungs are involved, and obvious pain when moving or being touched near the abdomen or pelvis.

An enlarged prostate isn’t always cancer

This is one of the most important things to understand before you panic. Several different conditions can cause a dog’s prostate to enlarge, and most of them are far less serious than cancer.

	What it is	Who it affects	Treatment
Benign prostatic hyperplasia (BPH)	Non-cancerous, hormone-driven enlargement	Intact male dogs	Neutering or hormone therapy; doesn’t progress to cancer
Prostatitis	Bacterial infection of the prostate	Any male dog	Antibiotics; generally treatable
Prostatic cysts	Fluid-filled sacs in or around the prostate	Any male dog	Draining or surgical removal; not cancerous
Prostatic adenocarcinoma	Malignant cancer	Both neutered and intact dogs	No cure; radiation, chemotherapy, NSAIDs, palliative care

If your vet finds an enlarged prostate, imaging and possibly a tissue sample will be needed to figure out which of these you’re dealing with. Don’t assume the worst, but don’t wait to get answers.

What causes prostate cancer in dogs?

The honest answer is that no one knows exactly what causes prostatic adenocarcinoma in dogs. There’s no single trigger researchers have pinpointed. What we do know:

• Age is the biggest risk factor. Most affected dogs are 8 years or older.
• Breed may play a role. Some breeds appear more frequently in case studies, though prostate cancer can affect any breed or mix.
• Neutering doesn’t reduce the risk the way it does for other prostate conditions, and this remains an active area of research.
• There’s no strong evidence linking diet or environment to prostate cancer in dogs, though research is ongoing.

Diagnosis: what to expect at the vet

Your vet will start with a physical exam, including a rectal exam to feel the prostate directly. From there, the diagnostic workup typically includes:

• Abdominal ultrasound: a painless scan that lets the vet see the size, shape, and texture of the prostate and check nearby lymph nodes for signs of spread
• Chest X-rays: to check whether cancer has already spread to the lungs
• Urinalysis: looking at urine under a microscope for abnormal cells
• Fine needle aspiration (FNA): a minimally invasive procedure where the vet inserts a thin needle into the prostate (usually guided by ultrasound) to collect cells for examination under a microscope
• Biopsy: a slightly more involved procedure that collects a small tissue sample for a more definitive diagnosis, when FNA results are unclear

Staging, which means determining how far the cancer has spread, shapes every treatment decision. A dog with localized disease (cancer still contained to the prostate) has different options than one where metastasis has already occurred.

Treatment options for prostate cancer in dogs

There’s no cure for prostatic adenocarcinoma in dogs, and that’s a hard truth. But treatment can meaningfully extend quality of life and survival time.

Radiation therapy 

Aimed at slowing tumor growth and reducing pain. This is often the most effective option for localized disease. Combined with NSAIDs and chemotherapy, some dogs have achieved median survival times of over 20 months.

Chemotherapy 

Chemotherapy is used to slow spread or manage symptoms, often alongside radiation and NSAIDs.

NSAIDs (non-steroidal anti-inflammatory drugs) 

This is more than a comfort measure. COX-inhibiting medications like piroxicam and carprofen have shown significant benefit in dogs with prostate cancer, meaningfully extending survival time compared to dogs left untreated. NSAIDs are considered a standard first-line component of treatment, not just a palliative add-on. For guidance on managing dog pain safely, that’s a helpful reference alongside your vet’s recommendations.

Palliative care 

When aggressive treatment isn’t the right fit, the focus shifts to keeping your dog comfortable, managing pain, and maintaining quality of life for as long as possible.

Surgery 

Surgical removal of the prostate is rarely performed in dogs because of significant complication risks, including urinary incontinence.

Prognosis and life expectancy

The prognosis for prostate cancer in dogs is generally poor, primarily because the disease is usually diagnosed at an advanced stage. Median survival times with treatment typically range from a few months to around a year, depending on how advanced the cancer is at diagnosis, how well it responds to treatment, and your dog’s overall health.

The combination of treatment approaches matters significantly:

• NSAIDs alone: median survival around 6 months
• NSAIDs plus chemotherapy: approximately 10 to 11 months
• NSAIDs, chemotherapy, and radiation: over 20 months in some cases

Dogs with localized disease that responds to radiation tend to do better than those with distant metastasis at diagnosis.

What this means practically: the goal of treatment is often to give your dog more good days, not necessarily more total days. Quality of life matters, and your vet can help you think through what that looks like for your specific dog. For a broader look at types of dog tumors and how different cancers behave, that’s a useful companion read.

Does pet insurance cover prostate cancer in dogs?

Diagnosing and treating prostate cancer is expensive. An abdominal ultrasound, fine needle aspiration, chest X-rays, and a course of radiation therapy can add up to thousands of dollars, sometimes well before you’ve even started ongoing treatment or palliative care.

Prostate cancer in dogs is eligible for coverage under a Lemonade accident and illness policy, including imaging, biopsies, and treatments like radiation, chemotherapy, and prescription NSAIDs, as long as the condition isn’t pre-existing and develops after the 14-day illness waiting period has passed. That means your dog shouldn’t be showing any signs or symptoms of a prostate condition before your policy starts or during that waiting period.

Before we go

A prostate cancer diagnosis is genuinely hard news. It’s okay to feel scared, and it’s okay to need a moment before you’re ready to talk treatment plans. What helps most owners is having good information and a vet they trust. If you haven’t already, ask for a referral to a veterinary oncologist, a vet who specializes in cancer. They can give you a clearer picture of your dog’s specific situation and what the options realistically look like.

And if your dog is older and hasn’t shown any symptoms yet, now is a good time to think about coverage. Getting a Lemonade pet insurance quote before symptoms appear is one of the most practical things you can do for your dog’s future care.

Frequently Asked Questions

A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC.  The statements do not apply to policies underwritten by other carriers.