A bulge under Teddy's anus may be anal glands or tumors. It is best to take the dog to the hospital for examination. If it is anal glands, just squeeze them out and clean them. If It's a tumor and may require surgery. You should pay attention to squeezing the dog's anal glands regularly, otherwise it will easily cause anal infection or anal blockage. Generally, pet shops will help squeeze the anal glands when taking a bath.