Hard Egg Shaped Lump On Dog. A dog lipoma is a common soft tissue tumor that grows in fat cells. The idea is that if the tumor is malignant (i.e.
The exact cause of these nonthreatening but ugly lumps is unknown; Fat lumps in dogs are common and do not present major problems. Lump on leg i just noticed that my dog has a large lump just below the elbow on the back of her front leg.