As several people have mentioned, Cheerios are a yummy treat for Yorkies. I cut them in half for Sophie because she's so tiny and I don't want her to fill up on them. She also gets baby organic carrots from the farmers' market, but that's only 1-2 times a week. Her daily "treat-treat" is a small pinch of lowfat string cheese. I just barely peel the pkg. open and keep pinching off until she finishes it. It's her favorite training treat! I also give her organic dried liver treats, but not too much because they're so rich. I've tried peanut butter, but she's never very interested in it. One silly things she loves is when I giver her an ice cube and she bats it around the kitchen floor and licks it.