Transitional cell carcinoma (TCC) is the most common bladder cancer in dogs, and its early signs — straining to urinate, blood in urine, and frequent accidents — are easy to mistake for a urinary tract infection. Unlike a UTI, TCC does not clear with antibiotics. Catching it early, before the tumor obstructs the urethra or spreads to lymph nodes, dramatically improves outcomes.
Last reviewed: June 2026
What Is Transitional Cell Carcinoma in Dogs?
Transitional cell carcinoma — also called urothelial carcinoma — arises from the epithelial cells lining the bladder wall, urethra, and occasionally the ureters. It accounts for roughly 1–2% of all canine cancers yet is by far the most common urinary tract malignancy in dogs, as described in Withrow and MacEwen's Small Animal Clinical Oncology.
TCC most often originates at the bladder trigone, the triangular zone where the two ureters enter and the urethra exits. Tumors here quickly involve the ureteral openings and urethral lumen, causing obstructive signs months before metastatic spread. Approximately 50% of dogs have regional lymph node involvement at diagnosis, and 25–50% show distant metastasis to the lungs, liver, or bones if diagnosis is delayed (Knapp et al., 2014, Vet Clinics NA Small Animal).
Middle-aged to older female dogs are disproportionately affected — females develop TCC roughly 2:1 over males. High-risk breeds include Scottish Terriers (18–20 times the general population risk), West Highland White Terriers, Shetland Sheepdogs, Beagles, and Wire Fox Terriers. Chronic low-level exposure to lawn pesticides has been identified as a significant environmental risk factor.
Recognizing the Signs
Early TCC mimics a lower urinary tract infection — which is why so many dogs are treated with antibiotics for weeks before the tumor is found:
- Hematuria (blood in urine) — the most consistent sign; may range from pink-tinged urine to frank red blood
- Dysuria (straining to urinate) — the dog postures repeatedly, producing only drops or thin streams
- Pollakiuria — urgency every few minutes; indoor accidents in previously house-trained dogs
- Stranguria — painful, prolonged straining at the end of urination
- Urinary incontinence — dribbling urine, wet spots where the dog rests
- Recurrent UTIs — TCC damages the protective mucosal barrier, inviting repeated bacterial infections
- Hind-limb weakness or pain — when the tumor spreads to lumbar lymph nodes or vertebrae
- Weight loss and reduced appetite — in advanced disease
A dog with three or more antibiotic courses for presumed UTI without lasting resolution should be considered a bladder tumor suspect until imaging proves otherwise.
Diagnosis
Urine BRAF mutation test: Detects the BRAF V595E somatic mutation present in approximately 85% of canine TCC. A positive result is highly specific for TCC (Decker et al., 2015, PLOS Genetics). A negative result does not rule out TCC in the remaining 15%.
Abdominal ultrasound: Identifies bladder wall thickening, intraluminal masses, or trigone involvement. Also evaluates kidneys, ureters, sublumbar lymph nodes, and liver.
Chest radiographs (3 views): Screening for pulmonary metastasis at diagnosis and every 2–3 months during treatment.
CT scan: More sensitive than ultrasound for local invasion and urethral extent; recommended before surgery or radiation planning.
Cytology and biopsy: Cystoscopy-guided or traumatic catheter cytology can yield malignant transitional cells. Definitive diagnosis requires biopsy.
Treatment Options
TCC is rarely curable but multimodal management meaningfully extends survival and quality of life.
NSAIDs plus chemotherapy: Piroxicam alone achieves 18–22% objective response rates; combined with mitoxantrone or carboplatin, median survival extends to 7–11 months in dogs without distant metastasis, as described in Withrow and MacEwen's Small Animal Clinical Oncology.
Toceranib phosphate (Palladia): A targeted receptor tyrosine kinase inhibitor showing 30–35% objective response rates; often combined with NSAIDs.
Urethral stenting: Relieves obstructive uropathy when medical management is insufficient; dramatically improves quality of life in dogs with severe dysuria.
When to See a Vet
Call your vet today if:
- You see blood in your dog's urine, even just once
- Your dog is straining or frequently attempting to urinate with little result
- Indoor accidents have started in a previously house-trained adult dog
- A presumed UTI has failed to clear after one or two antibiotic courses
- Your dog is a Scottish Terrier, Westie, or Sheltie with any lower urinary signs
Go to the ER immediately if:
- Your dog cannot urinate at all — complete urinary obstruction is a medical emergency
- Your dog is straining intensely and crying in pain
- Vomiting, lethargy, and inability to urinate occur together — suggests uremia
- Sudden hind limb paralysis or inability to walk
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Frequently Asked Questions
How do you tell TCC apart from a UTI in dogs? A true UTI resolves with an appropriate antibiotic course; TCC does not. If your dog has had two or more antibiotic courses for lower urinary signs without lasting improvement, your vet should perform a bladder ultrasound and consider the BRAF urine mutation test. TCC typically produces persistent low-grade hematuria rather than the acute-onset type more typical of a simple infection.
Which dog breeds are most at risk for bladder cancer? Scottish Terriers carry 18–20 times the population risk for TCC. Other high-risk breeds include West Highland White Terriers, Shetland Sheepdogs, Beagles, and Wire Fox Terriers. Female dogs develop TCC at about twice the rate of males. Owners of at-risk breeds should ask about annual BRAF testing starting around age 6.
Is bladder cancer in dogs curable? Surgical cure is rare because TCC usually arises at the bladder trigone, making complete excision technically very difficult. Medical management — NSAIDs, chemotherapy, targeted therapy — regularly achieves disease stabilization. Median survival with treatment is 6–12 months; some dogs live 18–24 months with excellent quality of life.
How much does treating canine bladder cancer cost? Initial diagnostics — ultrasound ($300–600), BRAF test ($300–450), chest radiographs ($150–400), and bloodwork ($100–250) — typically run $900–1,700. CT staging adds $1,200–2,500. Monthly piroxicam costs $20–60; carboplatin chemotherapy cycles run $400–800 each; toceranib $250–500 per month. Urethral stenting adds $1,500–3,500 when needed. Ongoing monitoring visits every 2–3 months cost $300–800 each. Diagnosing early, before obstruction develops, reduces total cost considerably.
Can TCC spread to other organs? Yes — TCC metastasizes in up to 25–50% of dogs at diagnosis, primarily to sublumbar lymph nodes, lungs, liver, and bones. Full staging with chest radiographs and abdominal imaging at diagnosis is essential, as described in Withrow and MacEwen's Small Animal Clinical Oncology.
What is the BRAF test and should my dog have it? The BRAF V595E urine mutation test detects a specific DNA mutation found in approximately 85% of canine TCC, collected non-invasively from a free-catch urine sample. A positive result is highly specific for TCC and can allow treatment to begin without surgical biopsy. At-risk breeds are candidates for annual screening; any dog with recurrent lower urinary signs should be tested.
How do I keep my dog comfortable during TCC treatment? NSAIDs reduce tumor-associated inflammation and pain while also having anti-tumor activity. Short consistent walks, easy indoor bathroom access, and reduced stress lower the demand on an already-irritated bladder. Monitoring urine output at home — counting urination attempts and watching for any inability to void — is the most important thing owners can do between appointments.
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