I am looking for fun ways to play with my dog and nice activities to keep him busy. The thing is that he doesn't like tennis balls, sticks, squeakies, and generally any other toy that I have presented to him. He plays fetch every now and then because I taught him to do so, but he doesn't seem to be motivated by the activity itself, but by rewards he gets for it. He tires of it quickly. Do you have suggestions as to really nice toys that dogs can't resist? Or other nice ways to play with him?