FR
ENWhat is TCC?
Transitional cell carcinoma (TCC) is a malignant, invasive cancer of the urinary system, most commonly located in the bladder. Although it accounts for only 2% of all canine cancers, it is the most frequently diagnosed urinary tumor in dogs. The vast majority of TCCs are high-grade, aggressively invading the muscular layers of the bladder wall.
Grade and aggressiveness
TCC can be classified as low-grade or high-grade. The majority of dogs develop high-grade TCC, which invades the deep layers of the bladder wall and carries a high risk of metastasis.
Possible locations
The bladder is the most common location, often at the trigone (junction area). TCC can also develop in the urethra, ureters, prostate, or kidneys, sometimes complicating treatment options.
Genetic factors
Certain breeds appear predisposed, particularly terriers (Scottish, West Highland White, Shetland, Fox Terrier). Genetic factors and at-risk family lines have been identified in these breeds.
Environmental factors
Exposure to older topical antiparasitic products (flea/tick treatments), agricultural pesticides, or insecticides is associated with increased TCC risk. Obesity may also be a contributing factor.
Tumor growth can obstruct urinary flow and spread (metastasize) to regional lymph nodes or distant organs such as the lungs and liver. Early detection is essential to maximize therapeutic options.
Signs and symptoms
TCC symptoms often resemble those of a urinary tract infection or cystitis, which can delay diagnosis. Any persistent or recurrent urinary sign despite antibiotic treatment should be investigated further.
Early stage
- •Straining to urinate (stranguria)
- •Pink or bloody urine (hematuria)
- •Excessive licking of the penis or vulva
- •Hunched posture while urinating
- •Mild lethargy
- •Less self-grooming than usual
Intermediate stage
- •Progressive weight loss
- •Increased thirst and urinary frequency
- •Reduced activity, less interest in play
- •Recurrent urinary infections despite antibiotics
- •Urinary incontinence
- •Redness or irritation around the penis or vulva
Advanced stage
- •Withdrawal, quieter or hiding behaviour
- •Marked loss of appetite
- •Nausea, vomiting
- •Diarrhea or constipation
- •Increased abdominal pain (tense abdomen, whimpering)
- •Urine scalding of surrounding skin
When to seek immediate help?
Certain signs indicate a medical emergency requiring immediate veterinary attention. Go to the clinic right away if your dog shows:
- Complete inability to urinate despite repeated straining (total urinary obstruction)
- Respiratory distress: intense panting, difficulty breathing
- Inability to stand or walk / sudden collapse
- Bluish discoloration of gums or tongue (cyanosis)
- Uncontrollable vomiting or diarrhea
- Persistent whimpering or crying in pain
How is the diagnosis made?
TCC diagnosis relies on a combination of clinical examination, laboratory tests, and imaging. Since symptoms resemble other urinary conditions, multiple steps are needed to confirm the cancerous nature of the mass.
Clinical examination and history
Abdominal palpation to detect a bladder mass. Detailed history collection (duration of symptoms, response to antibiotics, predisposed breeds, environmental exposures).
Urinalysis and bloodwork
Urinalysis to detect blood, abnormal cells, and signs of infection. Bacterial culture to rule out pure infection. Complete blood panel to assess general health and kidney function.
Diagnostic imaging
Abdominal ultrasound to locate and measure the bladder mass. Chest X-rays to detect possible lung metastases. CT scan for precise assessment of local and distant extension.
Histological confirmation
Biopsy via cystoscopy (bladder endoscope) or during surgery to confirm the cancerous nature and grade of the tumor. This step is essential for a definitive diagnosis.
Full staging
Assessment of local extension (trigone, urethra, prostate), regional lymph nodes, and distant metastases (lungs, liver). Approximately 20% of dogs already have metastases at the time of diagnosis.
Treatment and management
There is no single curative treatment for TCC. The approach is multimodal: combining symptomatic care, anti-cancer medications, and, depending on the situation, surgical or complementary interventions. The primary goal is quality and duration of life.
- Urethral or ureteral stent: small tube placed endoscopically to relieve an obstruction and restore urinary flow.
- Cystotomy / diversion: surgical opening of the bladder or creation of a cystostomy tube in cases of severe obstruction not otherwise treatable.
- Infection management: frequent urinalysis, culture-directed antibiotherapy: secondary infections are common and must be treated promptly.
- NSAIDs (e.g. Piroxicam): show direct anti-tumor activity: slow progression or stabilize the tumor. Often used alone or in combination.
- IV chemotherapy: combined with NSAIDs, can induce partial remission or stabilization. Protocols vary based on patient tolerance.
- Surgery (partial resection): rarely curative, but can reduce tumor size and relieve symptoms (palliative resection).
- Metronomic chemotherapy: low daily oral doses at home (e.g. chlorambucil, cyclophosphamide): aims to contain long-term progression.
- Laser ablation: reduces the mass under cystoscopic guidance, relieves obstruction and improves comfort without definitive cure.
- Radiation therapy: can control the tumor but often causes local side effects (inflammation, bladder ulceration) that may be difficult to manage.
What to expect?
TCC prognosis depends on tumor grade, extent of disease at diagnosis, tumor location, and response to treatment. It is considered manageable but not curable in most cases.
TCC is considered a manageable disease. A consultation with a veterinary oncologist can help explore all available options and define a personalized care plan, including palliative care to preserve quality of life.
Home management tips
What to do
- Administer all medications as prescribed (NSAIDs, oral chemotherapy, antibiotics if prescribed)
- Encourage hydration: fresh water always accessible, water fountain if possible
- Offer wet food to supplement fluid intake
- Install non-slip surfaces (rugs) for weakened dogs
- Elevate food and water bowls to ease posture if needed
- Monitor daily: appetite, weight, urination (frequency, colour, effort), behaviour
- Keep a journal of good and bad days to detect any worsening
- Regularly inspect the genital area for irritation, discharge, or signs of infection
- Trim the hair around the genital and rectal area to maintain hygiene
- Minimize stress (calm environment, stable routine)
What not to do
- Stop NSAIDs or chemotherapy without veterinary advice
- Give human pain relievers or anti-inflammatories (ibuprofen, acetaminophen, toxic to dogs)
- Ignore an inability to urinate, even briefly: it is an emergency
- Apply firm pressure or manipulation to the abdomen
Always
- Maintain regular veterinary follow-ups with urinalysis and imaging
- Report any sign of urinary obstruction or severe pain immediately
- Discuss quality of life evolution with your veterinarian
Frequently asked questions
Is TCC curable?
What is Piroxicam and why is it used?
What is metronomic chemotherapy?
How do I know if my dog is in pain?
Should we consult a veterinary oncologist?
This guide is provided for informational and educational purposes only. It does not constitute veterinary medical advice and is not a substitute for a consultation with a qualified veterinarian. Every animal is unique and their health must be evaluated individually. If you have concerns about your pet's health, contact our clinic or consult a veterinarian promptly.
Is your dog showing worrying urinary signs?
Prompt diagnosis is essential for TCC. Our veterinary team is here to evaluate your dog and guide you toward the best care options.