Early Symptoms, Diagnosis, Treatment, Prognosis, and Care Guide for Canine Bladder Transitional Cell Carcinoma

Oncology/CancerDiseasesMeongsiljang Veterinary Advisory Board

We’ve compiled evidence-based veterinary information on transitional cell carcinoma (TCC), the most common bladder cancer in dogs, covering early symptoms, diagnosis, treatment, prognosis, and home care.

What Is Canine Bladder Transitional Cell Carcinoma?

A veterinarian performing an abdominal ultrasound on a puppy.

Canine bladder transitional cell carcinoma (TCC) is a malignant tumor that arises from the transitional epithelial cells (urothelial cells) lining the bladder mucosa. It is a well-known type of bladder tumor, frequently cited as a representative example of lower urinary tract tumors in veterinary textbooks. Early detection is crucial for prognosis, so recognizing initial symptoms is key. If your dog experiences persistent symptoms such as blood in the urine (hematuria), frequent small-volume urination (pollakiuria), or difficulty urinating with straining (dysuria), it may not be simple cystitis. We recommend regular urinalysis and advanced diagnostic testing, especially for breeds with reported TCC cases, such as Shetland Sheepdogs, or if hematuria and pollakiuria do not improve with antibiotic treatment.

Causes and Risk Factors

Bladder transitional cell carcinoma (TCC) is a tumor that develops when urinary tract cells undergo malignant transformation and abnormal proliferation. In other words, it arises from the urothelial cells lining the bladder, but the exact cause of why it develops in certain dogs remains unknown.

Location: While it primarily occurs in the bladder, it can also affect the urethra and, in rare cases, spread to the kidneys or ureters.

Common Site: Within the bladder, TCC frequently develops in the trigone—the area where the ureters connect—making diagnosis and treatment more challenging.

Reported Breeds: Certain breeds, such as Shetland Sheepdogs, have reported cases of TCC, so owners of these dogs should monitor for symptoms more closely.

Rather than focusing on risk factors that are not yet clearly established, it is more important to seek prompt veterinary evaluation for dogs showing persistent lower urinary tract signs, such as hematuria (blood in urine) or frequent urination.

Checklist of Early Symptoms That Are Easy to Miss

The symptoms of bladder transitional cell carcinoma closely resemble those of cystitis, so if the condition doesn’t improve with antibiotic treatment, a thorough diagnostic workup is essential.

Hematuria (blood in the urine): This is the most commonly reported sign, ranging from pale pink to deep red.

Pollakiuria (frequent urination): Your pet will need to go to the bathroom often, but only pass small amounts of urine each time.

Stranguria (difficult urination): Your pet may strain to urinate with little output and show signs of pain.

Urinary incontinence: Your pet may occasionally be unable to hold their urine and leak it.

Urinary obstruction: As the tumor progresses, it can block the urethra, leading to little or no urine output, or cause backpressure on the kidneys resulting in hydronephrosis.

If symptoms persist or recur after antibiotic treatment, please return to the clinic for further evaluation.

A puppy struggling to urinate and its worried owner

Signs That Require Immediate Veterinary Attention

If you notice visible blood in the urine, frequent trips to the bathroom with little to no urine output, or persistent hematuria and urinary frequency despite more than two weeks of antibiotic treatment, immediate diagnostic testing is essential. A complete urethral obstruction can quickly become a life-threatening emergency.

How Is It Diagnosed?

Diagnosing transitional cell carcinoma of the bladder requires a comprehensive approach using multiple tests.

Urinalysis and cytology: Microscopic examination of urine to identify tumor cells.

Abdominal ultrasound: Assesses bladder wall thickness, tumor location, and potential invasion into the kidneys or lymph nodes.

CT scan: A detailed imaging test that provides a three-dimensional view to determine the tumor's extent and check for metastasis.

Cystoscopy and biopsy: Direct visualization of the bladder interior with a camera, allowing for tissue sampling to confirm the diagnosis.

BRAF gene mutation test: A non-invasive urine test that detects specific genetic mutations present in over 80% of canine transitional cell carcinoma cases, aiding in early diagnosis.

Relying solely on long-term antibiotic treatment before a definitive diagnosis can delay detection.

Treatment Options — A Step-by-Step Overview

Bladder transitional cell carcinoma typically arises in the trigone region of the bladder, where the ureters connect, making complete surgical removal difficult in many cases. As a result, treatment primarily relies on combination therapies centered around medication.

NSAID therapy (piroxicam): This treatment aims to suppress tumor growth and alleviate pain. When piroxicam is used alone, a response rate of approximately 18% has been reported.

Chemotherapy: Combining piroxicam with chemotherapeutic agents such as doxorubicin, mitoxantrone, or carboplatin has been reported to increase the response rate to approximately 35%.

Radiation therapy: This is performed at select specialized clinics, with successful cases documented in the literature.

Surgery: Due to the tumor’s location, complete excision is often challenging. Surgery is typically limited to partial resection or procedures aimed at securing the urethra. The risk of tumor seeding at the surgical site must also be carefully considered.

The treatment plan varies depending on the tumor’s location, the presence of metastasis, and the dog’s overall health status.

A veterinarian and assistant staff preparing for a dog’s cancer treatment

Prognosis and Home Care

Bladder transitional cell carcinoma is often managed with a focus on maintaining quality of life and alleviating symptoms rather than achieving a complete cure. Prognosis varies significantly from pet to pet, depending on tumor location, stage of progression, and response to treatment.

Ensure adequate water intake: This helps flush the bladder lining and prevents urinary tract infections.

Regular urinalysis: Urine cytology allows for prompt assessment of treatment response and detection of recurrence.

Improve bathroom accessibility: Provide frequent outdoor walks or keep indoor potty pads easily accessible.

Monitor appetite and weight: Report any changes in appetite during cancer treatment to your veterinarian immediately.

Check for NSAID side effects: Discontinue use and seek veterinary care immediately if vomiting or bloody stools occur.

If you notice signs of urinary obstruction, such as little to no urine output, this may be an emergency requiring immediate veterinary attention.

A dedicated pet owner who carefully cares for their dog at home

What Owners of High-Risk Breeds Must Know

If you have a breed known to be at risk for transitional cell carcinoma, such as the Shetland Sheepdog, or if you’re concerned about recurring bladder symptoms, consider regular urine cytology and abdominal ultrasound screenings as your dog enters middle to senior age. Even in the absence of symptoms, early detection allows for a quicker review of diagnostic and treatment options. In particular, if blood in the urine or frequent urination persists despite antibiotic treatment, it’s safest to look beyond simple cystitis and pursue more thorough testing.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

How can you tell the difference between bladder transitional cell carcinoma and cystitis?

The symptoms are so similar that it’s difficult to distinguish between the two without an ultrasound or a urine cytology test. If hematuria and frequent urination do not improve or recur after 1–2 weeks of antibiotic treatment, further diagnostic testing is necessary. While cystitis often responds well to antibiotics, transitional cell carcinoma (TCC) typically does not.

Can surgery provide a complete cure?

TCC (transitional cell carcinoma) most often arises in the trigone of the bladder, making complete surgical removal difficult. Treatment typically involves combining medication with surgery, or performing a partial surgery to ensure urinary tract patency. It is important to consult with an oncologist to determine the tumor's location and whether it has metastasized before developing a treatment plan.

How are side effects managed during cancer treatment?

Your pet may experience a decreased appetite, vomiting, and lethargy. If severe vomiting, bloody stools, or a high fever develop after treatment, contact your veterinarian immediately. Encouraging your pet to drink plenty of water and switching to an easily digestible diet can also be helpful.

What is a BRAF gene mutation test?

This test analyzes urine samples to detect specific genetic mutations commonly found in canine transitional cell carcinoma (TCC). These mutations are present in a high proportion of cases—approximately 95% according to reports—making the test valuable for early diagnosis. It allows veterinarians to suspect TCC without the need for a biopsy, which is particularly useful when symptoms are ambiguous or for screening high-risk breeds.

What is the average life expectancy after diagnosis?

Prognosis varies significantly depending on the treatment method and the stage of tumor progression. When using piroxicam alone, the response rate is approximately 18%, whereas combining it with chemotherapy increases the response rate to about 35%. Survival times vary widely among individuals, making it difficult to predict precisely; however, earlier detection provides more treatment options and helps maintain a better quality of life for longer.

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References

[1] Withrow SJ, Vail DM, Page RL. Withrow & MacEwen's Small Animal Clinical Oncology, 5th Ed. Saunders, 2013. Chapter: Tumors of the Urinary System (Knapp DW, McMillan SK).

[2] Fossum TW et al. Small Animal Surgery, 5th Ed. Elsevier Mosby, 2019.

[3] Ettinger SJ, Feldman EC, Côté E. Textbook of Veterinary Internal Medicine, 8th Ed. Elsevier, 2017.

[4] Decker B, Parker HG, Dhawan D, et al. Homologous Mutation to Human BRAF V600E Is Common in Naturally Occurring Canine Bladder Cancer — Evidence for a Relevant Model System and Overlooked Clinical Opportunity. Clin Cancer Res, 2015.