Stomach cancer in dogs: what to know

A dog with stomach cancer may develop repeated vomiting, reduced appetite, weight loss, tiredness, abdominal discomfort or dark stools. These signs are not specific to cancer; infection, swallowed objects, ulcers and other illnesses can look similar. A dog cannot describe pain, so changes in posture, activity or eating habits are useful details for the veterinarian.

The veterinarian may perform a physical examination and recommend blood tests, abdominal imaging or an endoscopic examination. A tissue sample is often needed to identify the type of abnormal growth. Human pages about Stomach Cancer, chemotherapy or surgery should not be used as a treatment plan for an animal.

Contact a veterinarian promptly if vomiting or appetite loss continues, and record when signs began, what was eaten, drinking changes, stool appearance and any medicines or toxins that might be involved. Do not give human painkillers or leftover cancer medicines unless a veterinarian specifically directs you.

If a tumour is found, the veterinarian may discuss referral to a veterinary surgeon or veterinary oncologist. Options depend on the growth, the dog’s overall health and the family’s goals. Comfort, nutrition and control of nausea may be part of care even while the diagnosis is being clarified.

Seek emergency veterinary help for vomiting blood, black stools, a swollen or very painful abdomen, collapse, repeated unproductive retching, breathing difficulty or inability to keep water down. These signs can reflect bleeding, obstruction, shock or another emergency and should not wait for a routine appointment.

Ask which tests are needed, whether a biopsy is safe, how pain and nausea will be managed, what eating and drinking changes matter, and which signs mean you should return immediately. Ask for a written medication plan and the name of the veterinary service to contact outside normal hours.