Tumours (growths) may develop from the lining cells of these glands. These tumours are relatively uncommon in dogs, representing approximately 2% of all skin tumours, and they are very rare in cats. Anal sac tumours tend to be malignant and invade into tissues outside of the anal sac. Malignant melanoma in dogs - therapeutic melanoma vaccine. This tumour is generally malignant, in that it will grow to invade surrounding tissue, and, more importantly, may spread elsewhere within the body, particularly to the nearby lymph glands (lymph nodes) and the lungs. Most tumours in the mouth and many tumours of the nail bed are malignant.
Jan 17, 2019 · Anal Sac Tumors. Anal sac cancer Cancer can develop in the anal sac glands in dogs, but rarely in cats. In most cases, this tumor affects only one anal sac, but occasionally both left and right sacs are affected. Anal sac cancer is usually malignant and has a high tendency to spread to the other body parts. Melanoma in dogs is a rather common form of cancer that usually occurs in the mouth, on the toes, or on the skin. This page shows detailed information on the symptoms and treatment of canine melanoma.