Many middle ages and senior dogs, especially those that are overweight develop benign tumors under their skin. These growths are usually located on the belly or the upper legs and are generally harmless. If you notice a lump on your dog, have your veterinarian check it out. If it is a benign tumor and the dogs movement is not compromised, no treatment is necessary but it is still a good idea to keep an eye on the fatty deposit to make sure that it doesn’t grow. Your veterinarian can biopsy the growth every now and then to check for any cancerous changes. If your dog has one of these growths (lypoma), there is a chance that he will develop more. This doesn’t mean that you should dismiss any new growths or bumps. Have them checked out.  Ask your vet to give each one a proper exam. Usually no pet medication is prescribed and nothing else has to be done.