My dog has recently developed quite a large lump on his side near his spine. On Monday we took him to the vet who said that it's common for dogs to develop fatty lumps, but that this was too hard to be one and that he was concerned it could be something a bit more serious. He took a biopsy and said he'd call us with the results.
This afternoon he called to tell us that it is indeed a fatty lump, he's not quite sure why it's so hard but that it's nothing to be concerned about. Having already done the whole dog with cancer thing in recent years, today's outcome has pleased me greatly.