As far as treats go ... i recommend you try peanut butter for treats. But not in large quantities.
My little Jackie LOVES Ziwipeak treats. They are really healthy and natural. And if that doesn't help, try peanut butter. A lot of people do that. Just be careful - it should not contain a lot of sugar, that's bad. Try to buy really natural peanut butter. I'm from Europe and i order it from England. Jackie loves it! I don't give it to her every day, it's a special treat for her.