What about adding an egg to each meal, it's good for their coat and it adds a few calories.
Maybe some canned tripe? Cheese? A chicken breast? Some beef?
Have you ever tried satin balls?
Maybe try carrots and peantut butter or apples and peanut butter as snacks?
Sinister "The Prince of Darkness" 4 yr old black male GSD 3.11.09
Draco "Dakota's Unbreakable Vow" 5.5 mth old male Dalmatian 6.30.13
Cats: Chaos, Mayhem, Monster, Wicked