I can't help you with the diet, but I just want to say bless you for taking in this dog. For those not familiar with the story, here's the link:
http://www.yorkietalk.com/forums/yor...ml#post3030537. It's amazing he's in such good condition, and I'm glad he got the dental; I'm curious what his old home fed him, I hope Joey doesn that well at 15.