First of all, all dogs lose weight fed a good raw diet, because most dogs are fat and look like shit when fed kibble (especially overfed).
Second, depending on how big your dogs are, half a chicken quarter might not be enough, so feed the whole chicken quarter (maybe 1.5 chicken quarters).
You must remember that most of my dogs were in the high-20s to mid-30s, so if you have big dogs you might have to feed twice as much as what I feed.
You have to do the same with kibble: if you see a guy feeding 1 cup of kibble to 30 lb dogs, you can't feed your 45 lb - 50 lb dogs dog "1 cup" and think they're going to be okay
Jack