We couldn't detect where you are, so we're showing this market. Pick yours so the nearby-clinic links point to the right place.
Cancer in Dogs & Cats: Symptoms, Diagnosis, Treatment & Home Care [2025]
Nasal adenocarcinoma can cause nosebleeds and sneezing; early diagnosis is important for better treatment outcomes.
When to See a Vet
Seek Emergency Care Immediately
- •Persistent difficulty breathing or rapidly worsening respiratory distress
- •Inability to stand or sudden collapse
- •Heavy or uncontrollable bleeding
Schedule a Clinic Visit Soon (within 24–72 hours)
- •Noticeably reduced appetite lasting more than a few days
- •Significant weight loss that does not recover in the short term
- •New or enlarging skin mass or ulceration
01What symptoms indicate something is wrong?
Cancer in dogs and cats presents in many ways, often through changes in function and behaviour. Early signs can be subtle — a combination of owner observation and veterinary examination is needed to determine the right direction.
- Persistent or significant loss of appetite, accompanied by lethargy or low energy
- Unexplained weight loss or gradual wasting
- Recurring pain, obvious discomfort when touched, or avoidance behaviour
- Persistent discharge or bleeding from the mouth or nose, or recurrent sneezing
- Seizures, intermittent tremors, or sudden changes in behaviour
- New lumps on the skin or body, growing masses, or non-healing ulcers
- If any of the above signs appear, arrange a veterinary consultation as soon as possible
Seek emergency care immediately if you notice the following symptoms:
- ⚠️ Persistent difficulty breathing or worsening shortness of breath
- ⚠️ Sudden inability to stand or collapse
- ⚠️ Heavy or persistent bleeding that cannot be controlled
Pet Health Map App
Turn every worry into your pet’s health record
Download the app to save AI Care reports, build your pet’s medical profile, and keep tracking symptoms and care notes.
Android version coming soon. The web version is available now.
02How to assess changes at home: key observations and when to seek emergency care
Keeping systematic records of home observations helps your vet quickly assess the progression and trends of your pet's condition.
- Note the date symptoms first appeared, how often they occur, and when they worsen
- Track daily food and water intake, noting the time of any significant changes
- Weigh your pet at the same time each week and record the values and trend
- Film any lumps, oral changes, breathing difficulties, coughing, or seizures for reference
- Record changes in urination and defecation frequency, colour, or consistency
- List all current medications and supplements with their dosing schedule
03How will the vet diagnose this? Common diagnostic tests
Diagnosis typically combines physical examination, blood tests, imaging, and histological analysis to confirm the nature and extent of the lesion.
Physical examination
palpation of lumps, assessment of lymph nodes and pain response
Blood and biochemistry tests
evaluate overall organ function and pre-operative risk
Blood pressure monitoring and basic cardiopulmonary assessment to determine anaesthetic risk
X-rays
evaluate the chest, abdomen, or bones for suspected metastasis
Advanced imaging (CT, MRI, ultrasound) to characterise the extent of the tumour
Tissue sampling (fine-needle aspirate or biopsy) for pathological examination and staging
Referral to a facility offering advanced imaging and histopathology is recommended
04What treatment and care are needed? Medications, diet, and home care guide
Treatment options include surgery, medical therapy, or radiation — a tailored plan is required for each case, with long-term monitoring of side effects and response.
- Surgery: feasibility and extent are determined by tumour location and the pet's overall condition
- Medical therapy (including chemotherapy or oral medications) requires regular blood tests and side-effect monitoring
- Radiation or localised therapy is arranged based on tumour type and availability
- Nutritional support and dietary adjustment as adjuncts to maintain weight and quality of life
- Regular follow-up visits using imaging or blood tests to monitor disease progression and treatment response
- A specialist oncologist or veterinary teaching hospital is recommended to guide and monitor the treatment plan
05What to prepare before the vet visit: key information to help your vet assess quickly
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.