I have a little "chunky monkey" at my house also. He is a year and a half old and is on a special low protein diet for his MVD. He weighs 6 lbs and should weigh about 5. He gets tons of exercise but is such a little pig. He is always stealing the other dogs food and he's quick too. I may have to take more drastic measures. I've already stopped free feeding all of them.
I may have to break out the doggie jail for meal time. LOL