chicken jerky. Make sure it's made in USA or make it yourself with a dehydrator. Maggie likes REAL chicken jerky which can be hard to find (versus the "formed" types that call themselves jerky). The formed type can be okay, but I know of 2 other picky eaters who also like chicken jerky. Does anybody have a pup who doesn't like it?
This is currenlty the most reasonable, non-home made, made in the USA without extra ingredients. Maggie enjoys it immensely and I like giving her "real" food for a treat. Petco, you can tell by looking at it that it is real chicken breast.
Prairie Dog Jerky Dog Treats at PETCO
These are slightly more processed, but Maggie loves them as well. They are cheaper than the above.
True Chews Natural Chicken Jerky Dog Treat | Jerky | PetSmart
Blue Buffalo has some real chicken jerky that is great too, but the price is NOT great!