Caroline I use bits of real cheese in moderation to train my puppy ( 6 month old Keeshond female)/she loves the reward she gets and works hard to please💕 She is doing great / I have also tried little pieces of apple or a frozen blueberry /she likes the blueberries as she is teething and also loves gnawing on ice cubes and frozen broccoli or carrots ( not for training) hope this helps!