While as a professional handler I do not believe any animal should be fat ... but, if you have an animal whose metabolism is higher than others and they burn off what is taken in ... Chicken livers, bananas & pasta! Great for putting that pound on when needed before the show! I show many sporting & hound breeds that seem to run it off faster than it goes in. Have used this trick for years ... and on the BIS kids too!
I agree with some of the others, though. Check the fecal to make sure there isn't an underlying problem ... and get them on a better dog food than Alpo! It's not one you see advertised around dog shows or field trials! Wouldn't that be a hysterical ad campaign!