Perianal adenomas are benign tumors that form around oil glands located near your dog’s anus. These tumors are only in the skin and are not attached to any other bodily structures. Because these tumors' growth is spurred by the presence of testosterone, they are most often found in adult male dogs.

You will feel or see a lump or lumps (tumors) around the anus or base of your dog’s tail. The tumors often ulcerate, breaking the skin.

The exact cause of perianal adenomas is unknown.

A physical examination along with a biopsy or fine needle aspiration is required to diagnose perianal adenomas and differentiate them from adenocarcinomas, an aggressive type of cancer.

In some cases, perianal adenomas will go away on their own. Smaller tumors may be treated with cryosurgery (frozen off) or surgically removed. The tumors can grow quite large, so it is best to remove them promptly. Antibiotic creams may be used where the skin is broken to stave off infection.

Neutering a male dog is the best prevention for perianal tumors.

No, you cannot contract perianal adenomas from your dog.