We switched Poplin from the Nature's Balance vegetarian dog food his old owners had him on to a mix of Canidae, raw chicken, ground beef, yogurt, eggs, cottage cheese, and the occasional table scrap. His poopies are back to normal, his dandruff has all but vanished, and his neck got about 1/2" thicker in just the last week (he's gaining weight).
Hi breath isn't as nasty anymore too, although he does still have some naaaaasty gas. hahaha
Question: When was your pit full grown? Poplin is about 17 months old and he still has lots of loose skin around his neck, making me think he's still got a bit of growing to do.