I adopted my dog Smiley in August and he has all the properties of a great disc dog, except he does not catch things! I don't know much about his background, other than he was dumped at a shelter because he was "chewing the kids' toys". Anyway, he's incredibly fast, can jump really high and has good drive for stuffies and tugs, but he will not catch things! He just lets toys and treats bop him on the head! Are there exercises that I can start with him that will teach him to catch?? And what is a good way to introduce a disc and build drive for chasing the disc?