Yeah, I have a dog called Laddie. He's a labrador. He was a fatty before, lol I used to call him my lil tub of butter =P But then the vet said he was too fat so we had to put him on a diet... he hates being on a diet. X3 But he's lost weight now and is looking pretty good, and is more energetic... he's still a little bit fatter than most labradors though.
Oh and a few years ago I had a guinea pig called Rusty. For a period of time he was a biiiiig fatty. We had some tunnels and stuff for the piggies to hide in and Rusty would always get stuck in them. But then later on he got sick with something, I'm not sure what it was, but he ended up getting really skinny and eventually died :[