I have a 7 month shih tzu who is really smart but not obedient , i have trained him to do all the basic things like housebreak ect. but i want to teach him some tricks . Everytime i play fecth with him , he refuses to give up the ball . I would like to know some recommendations on doggy treats , i have gone to Petsmart and spent quite a bit on some brands that he has no interest in them . What are some doggy treats that my puppy will more likely love ?