What are the common early signs of kidney adenocarcinoma in dogs and cats?

Common signs include lethargy, reduced appetite, weight loss, changes in drinking or urination, and blood in the urine. If symptoms persist, consult your vet to arrange appropriate tests.

How does the vet usually investigate kidney adenocarcinoma?

The vet will evaluate with blood tests, urinalysis, and abdominal imaging (ultrasound, X-ray). A fine-needle aspirate or tissue biopsy may be taken for pathological confirmation when needed. Ask your vet about the examination steps.

What treatment options are available for kidney adenocarcinoma?

Treatment may include surgical removal, medication or chemotherapy, and supportive care. The right approach depends on the extent of the tumour and your pet's overall health — discuss the most suitable plan with your vet.

What is the prognosis for my pet after diagnosis?

Prognosis depends on tumour size, whether it has spread, and overall kidney function — outcomes vary considerably between individuals. Post-operative care and regular follow-up can improve quality of life; follow your vet's assessment and recommendations.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Kidney Adenocarcinoma in Dogs & Cats: Lethargy, Blood in Urine, Diagnosis & Home Care [2025]

Renal adenocarcinoma may cause blood in the urine or an abdominal mass — early detection and surgical removal generally lead to a better prognosis.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: VCS, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Large blood clots in the urine that continue without stopping
•Extreme weakness with inability to stand or walk on its own
•Persistent vomiting with inability to keep down normal water intake

Schedule a veterinary visit soon (within 24–72 hours)

•Intermittent blood in the urine or long-term abnormal urine color
•Persistently low energy or markedly reduced activity
•Ongoing weight loss or noticeable wasting over several weeks

01What Symptoms Signal a Problem?

Kidney adenocarcinoma typically progresses gradually. Chronic lethargy, urinary changes, and weight loss are common, though early signs can be subtle.

Persistent lethargy, reduced activity, and general fatigue
Continuous or progressive weight loss and visible thinning
Bloody, cloudy, or clot-containing urine
Tenderness or reluctance to be touched in the flank or kidney area
Increased water intake or changes in urination (frequent or reduced output)
Decreased appetite, occasional vomiting, or prolonged refusal to eat
If obvious blood in the urine or sustained weakness is present, seek veterinary assessment promptly

Seek emergency care immediately if you notice the following symptoms:

⚠️ Large blood clots in the urine or continuous bleeding
⚠️ Extreme weakness or inability to stand
⚠️ Persistent vomiting with inability to keep fluids down

02How to Assess Symptoms at Home: Key Observations & Emergency Criteria

Keeping a home record of key changes helps your vet make a faster assessment and arrange the right tests and treatment.

Note the exact date and time when symptoms first appeared
Weigh your pet at the same time each day and log the readings
Measure and record daily water intake and number of urinations
Use your phone to film the urination process or any abnormal urine
Note whether urine is cloudy, contains blood clots, or has an unusual odour
Record changes in appetite and the timing and frequency of vomiting
Seek immediate veterinary care if heavy blood in the urine or marked weakness occurs

03How Will the Vet Diagnose the Condition? Common Tests

At the clinic, the vet will use blood tests, urinalysis, and imaging to assess kidney function and check for masses or metastasis.

Complete blood count (CBC)

assess for anaemia or inflammation

Blood biochemistry

evaluate kidney function markers and electrolyte imbalances

Urinalysis

including urine sediment, proteinuria, and urine specific gravity

Abdominal ultrasound

assess kidney morphology and detect any masses

X-ray

evaluate kidney outline and screen for possible thoracic or abdominal metastasis

Fine-needle aspirate or tissue biopsy

obtain pathological confirmation when necessary

Referral for advanced imaging such as CT scan to determine the full extent of disease when indicated

04How Is the Condition Treated and Managed? Medications, Diet & Care Guide

Treatment may include surgical removal, medication, or supportive care, and requires regular monitoring of kidney function and imaging to evaluate progress.

Tumour removal requires thorough pre-operative assessment and should be performed by a specialist team
Medical therapy or chemotherapy is arranged by the vet after evaluating the condition and risks
Use a kidney-specific diet or dietary modifications to reduce the burden on the kidneys
Home care includes adequate rest and daily recording of symptoms and food intake
Return for regular check-ups covering blood tests, biochemistry, and imaging to track progress
Discuss prognosis, quality of life, and a long-term follow-up plan with your vet

05What to Prepare Before the Vet Visit: Key Information to Help Your Vet

Record a video of urination and note the time for the vet's reference

Collect a fresh urine sample if possible, refrigerate it, and bring it to the clinic

Compile a log of daily water intake, urination frequency, and body weight

Record urine colour, the presence of blood clots, and how often it occurs

List when symptoms started, any relevant medical history, and current medications

Bring previous blood test results and imaging reports if available for comparison

If a tumour is suspected, consider booking a specialist oncology or internal medicine appointment in advance

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.