While your dog may not be able to tell you heвЂ™s in pain, there are some signs you can watch for, including: Drooling/excessive salivation (a symptom of nausea).Black stools are also an indication of an ulcerated stomach tumor. This is due to ulcerating tumors, or tumors that break open and bleed. This is often the first sign and it may appear blood-tinged or resemble coffee grounds as the condition progresses. Symptoms of stomach cancer in dogs usually develop gradually over weeks or months, with vomiting being the most common. In dogs, mast cell tumors are more commonly diagnosed as benign and are easily treatable with surgery, but they can be more aggressive in some cases and spread to other parts. They are the cells responsible for fighting harmful pathogens, such as viruses and parasites.ДЄ mast cell tumor (MCT) consists of a group of mast cells that commonly form as a mass on the skin, but can also grow in other parts of the body, including the stomach. These are normal cells found in most organs and tissues of the body that serve the immune system and allergic response. Mast Cell TumorsДЄnother type of tumor that can develop in a dogвЂ™s stomach involves mast cells. However, they also run the risk of interfering with stomach function as they continue to grow. Benign Stomach TumorsД«enign stomach tumors are less commonly diagnosed in dogs. Less common malignant tumors include leiomyosarcomas, which form on the muscles lining the stomach and intestines, and lymphomas вЂ“ also known as alimentary or gastrointestinal lymphomas, which develop in immune system cells known as lymphocytes. The most common, gastric adenocarcinomas, originate in the lining of internal organs and can invade different parts of the digestive tract. Unfortunately, the majority of stomach tumors in dogs are diagnosed as malignant.

When left untreated, both can continue to grow and interfere with stomach function, while also increasing the risk of tumor ulceration and gastric obstruction.Д¬ases involving ulcerating tumors also run the risk of developing a stomach perforation, or a hole in the stomach, which can lead to a dangerous, sometimes life-threatening condition known as peritonitis. These may be benign (non-cancerous) or malignant (cancerous) with chances of spreading to other parts of the body. There are a few different types of tumors that can grow within a dogвЂ™s stomach. Both benign and malignant stomach tumors are more common in older dogs, particularly males around 9 years of age.Д«reeds known to be more at risk of developing stomach cancer include: The cause of stomach cancer in dogs is generally unknown, but there are some associated risk factors, including age, sex and breed. This cruel disease often shows no symptoms until it has already reached advanced stages and is more commonly seen in older dogs. Stomach cancer may not be one of the most common types of canine cancer, but it can be one of the most devastating. Canine Stomach Cancer: Symptoms, Treatments and Prognosis

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