What does interest him? Every dog is different, but usually you can teach a dog to do things with the proper motivation. Does he like things that squeak? Does he like certain treats? You can teach him things like fetch by using a reward that will interest him, and if you find it fun and exciting, he'll probably catch on. If it means motivating him with treats as well as praise at first, hey, that may be what it takes!

Mind you, our Great Dane never ever learned fetch, but she had been malnourished before we got her, so we think she had some brain damage. She was sweet as can be, so we just gave up throwing anything we didn't want to have to go get ourselves.