Gastric Adenocarcinoma

Gastric adenocarcinoma is a type of cancer that arises from the glandular cells lining the stomach. These cells normally produce mucus and digestive fluids, but when they become cancerous, they can form masses or thicken the stomach wall in ways that interfere with normal digestion and movement of food. It occurs most commonly in older dogs, with certain breeds appearing more susceptible, and is less frequently diagnosed in cats. Owners often arrive at this page because their dog or cat has been vomiting intermittently, losing weight despite a reasonable appetite, or showing a gradual decline in energy and interest in food. These signs can develop slowly over weeks or months, and may initially be mistaken for less serious digestive upset. In some cases, the condition is discovered during investigation of anaemia or abdominal discomfort. This page explores the signals that may prompt investigation, what is happening at a tissue and cellular level, how the condition is identified through imaging and biopsy, and the range of approaches that exist—including surgery, chemotherapy, and supportive care—each with its own considerations and limitations.