Last night I was watching some Kikopup videos on Youtube, and she mentioned that the ideal size training treat for a large dog is about the size of a pea. It was late, and I probably should have been in bed hours before, but the idea that popped into my mind then was, "Why not just use peas, then?"
Well, the idea stuck, and I went out tonight and bought some frozen peas. The dogs LOVE them! Even Gavroche, who doesn't usually touch vegetables, loves them. No cutting required, low calorie, and firm enough to stand up to pockets and treat bags. And cheap, too, at about $1 a bag.