If your dog has an anal gland tumor, he may present some or all of these symptoms: Scooting his hind end along the ground. Licking of the perianal area. A lump beside the anus. Straining and displaying difficulty passing feces. Blood in the stool. Adenocarcinoma, Anal Sac/Perianal in Dogs While anal gland/sac cancer (adenocarcinoma) is not common, it is an invasive disease that does not generally have a positive outlook. Usually seen as a rectal growth (mass) on the animal, it also is common to find the disease in the lymph nodes.
Adenocarcinoma is the most common cancerous anal gland tumor in dogs. It's a very aggressive cancer and has a high probability of metastasizing (spreading) to the lymph nodes and other organs. The recommendation for treatment is surgical removal as soon as possible. This surgery is tricky and does not have a high success rate, if not done properly. Anal gland cancer is fairly uncommon, but is very serious when it occurs as it produces malignant tumors. Should your dog have an issue with his behind, it’s more likely to be a blockage, infection or impaction of his anal sac. Regular yearly check ups with your vet will include a rectal examination.
Thankfully, cancer of the anal glands, also called adenocarcinoma, is not a common disease in dogs and is even more rare in kitties. However, when it does occur, it is invasive and often carries a very poor prognosis. Anal gland cancer appears as a rectal mass and is frequently also found in the lymph nodes. Anal sac adenocarcinoma is reported to represent 2% of all skin tumors and 17% of perianal tumors in dogs. 1,2 So although it is an uncommon tumor, it is locally invasive and has a high rate of metastasis to the draining iliac lymph nodes, making early diagnosis and treatment essential for long-term control. Hypercalcemia of malignancy is seen in some cases as a paraneoplastic syndrome and may .