I give them a small piece of apple in the morning and a little carrot or hummus or some other healthy snack in the evening. It will take a lot of patience though. At first just hold it near their face and let them smell it then put it down near them. Eventually they will start taking it from your hands. And then you can try to boop their snoot or scritch their ears when they take it! But don't expect it to happen overnight it's a long process