My boxer, Ziggy, has a large lump that developed above and to the right side of his tail. It first appeared about a month ago, but never seemed to bother him and eventually went down. Now, it has returned. From everything I have researched, I don't believe it is a swollen anal gland due to it's location. It feels firm but somewhat pliable to the touch and does not seem to bother him in the least. He never tries to reach it, doesn't scoot his butt on the floor, and doesn't mind if we touch it. It just looks bad. Not quite sure of his age because he was a rescue in 2005, but we think somewhere around 8 1/2. Anyone have a similar experience or any idea what it might be? Any help would be greatly appreciated.