Does a lump always mean cancer?

Not necessarily. Lumps can be benign or inflammatory in nature. Cytology or biopsy is needed to confirm the diagnosis, so schedule further tests with your vet.

What tests will the vet use to confirm cancer?

Common tests include a physical examination, blood work, X-rays, ultrasound, and cytology or tissue biopsy. A CT scan or specialist referral may be arranged if needed.

Will chemotherapy cause my pet significant distress or loss of appetite?

Chemotherapy may have side effects, but most protocols are designed to manage them while maintaining quality of life. Your vet will assess the risks and provide supportive care throughout treatment.

How much does cancer treatment generally cost?

Costs vary widely depending on the tests and treatment required. Ask your clinic about estimates and payment plan options before proceeding.

How much do the tests and treatment for this condition usually cost?

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

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.

Disease Guide

Lung Adenocarcinoma in Dogs & Cats: Symptoms, Diagnosis & Treatment [2025]

Lung adenocarcinoma is a malignant pulmonary tumour. Early signs are often subtle — persistent coughing or difficulty breathing warrants a veterinary check.

Take 1 minute to check the symptoms first

Last updated: 2026/01/04

Pethealthmap Editorial Team

Sources: ACVIM, WSAVA, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Obvious difficulty breathing or open-mouth breathing with lethargy
•Persistent high fever with noticeably poor responsiveness and weakness
•Sudden inability to stand or extreme weakness preventing self-movement

Schedule a Clinic Visit Soon (Within 24–72 Hours)

•Persistent or intermittent coughing lasting more than a few days
•Noticeably increased or decreased water intake or urination
•New lump or swelling that continues to change

01What symptoms indicate something is wrong?

Dogs and cats with tumours or cancer may show a range of physical and behavioural changes. Symptoms vary depending on the tumour's location and how advanced it is.

Frequent urination or noticeable changes in urination habits (abnormal frequency or volume)
Increased water intake or unusual thirst with significant changes in drinking over a short period
Intermittent or persistent low-grade fever, unstable body temperature, and reduced alertness
Recurrent or persistent cough, changes in breathing sounds, or rapid breathing
Decreased exercise tolerance, notably reduced activity, or easy fatigue
Reduced appetite, weight loss, or persistent vomiting and diarrhoea

Seek emergency care immediately if you notice the following symptoms:

⚠️ Obvious difficulty breathing or open-mouth breathing with lethargy
⚠️ Persistent high fever with marked weakness and unresponsiveness
⚠️ Sudden inability to stand or extreme weakness preventing self-movement

02How to assess abnormalities at home? Key observations and emergency criteria

Observing and documenting key changes at home helps your vet make faster assessments and arrange appropriate tests.

Record daily urination frequency, appearance, and any blood or abnormal odour
Measure and note daily changes and trends in water consumption
Take regular temperature readings and note the timing and duration of any fever
Film short videos of coughing, breathing difficulties, or restricted movement to bring to your appointment
Observe and record activity level, exercise tolerance, and mental alertness
If abnormalities persist or worsen, contact your vet promptly to arrange a consultation

03How will the vet diagnose the condition? Common diagnostic tests

At the clinic, the vet will use a systematic physical examination combined with imaging and sample analysis to confirm the location and nature of the lesion, and assess overall health.

Physical examination

palpation of suspected masses and lymph nodes, overall health assessment

Blood tests

evaluation of liver and kidney function, blood cell counts, and overall metabolic status

X-ray

assessment of thoracic, abdominal, or focal skeletal lesion distribution

Cytology or tissue biopsy

microscopic evaluation to determine the pathological nature of the lesion

Advanced imaging (CT/MRI)

used for lesion localisation or staging; specialist referral may be recommended as needed

04How to treat and care after diagnosis? Medication, dietary adjustments, and care guide

Cancer treatment typically involves a multi-modal approach requiring individualised planning and long-term follow-up with supportive care to maintain quality of life.

Develop a surgical, chemotherapy, or radiation therapy plan based on pathology results and staging
Regularly assess side effects and treatment efficacy for medications and supportive care
Schedule regular follow-up visits with repeat blood tests or imaging to monitor disease progression
Adjust diet and home care to maintain nutrition and comfort
Chemotherapy or advanced treatment is recommended at a hospital with specialist oncology experience
Return for re-evaluation promptly if symptoms change or quality of life declines

05What to prepare before the vet visit? Key information to help your vet quickly identify the cause

Bring a short video of coughing, breathing difficulties, or restricted movement to the clinic

Prepare a record of when symptoms started, how they have progressed, and how long they have lasted

Document specific changes in endurance after walks or physical activity

Record appetite, water intake, and recent weight change measurements

Bring any existing test reports (blood work, X-rays, ultrasound) and your pet's current medication list

Call ahead to confirm and book an appointment at a clinic equipped for imaging or advanced diagnostics

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.