Bella hasn't had peanut butter but I am sure she would love it. Now ice cubes....there is her passion! We found this out accidentally once when an ice cube fell out of the ice dispenser and she ran off with it. From then on she was hooked on them. Now when she hears the clang, clang of someone getting ice cubes she comes running in the kitchen, no matter what she is doing, and parks herself right by the refrigerator, tail wagging. She probably gets several a day and chews them up with gusto as if they were a juicy steak!