He's only four. It's about the size of a Canadian quarter (about the size of one pence?), has discrete edges and moves freely under the skin and over the muscle. Needless to say, he's got an appointment with the vet, but not until Monday. Before my mind goes to scary possibilities, I wonder if anyone here has had a cocker with a lump similar to my description. I know dogs get fatty lumps, but I do't kow if they can be identified by characteristics such as those. Meep.