I have a heeler/lab mix who apparently cannot get tired. Only bored. I can throw the ball for him until he stops chasing it, then take him on a long walk, and then throw the ball some more until he gives up... but he does not get tired. He is a very smart dog, and rather athletic. I've thought of trying to get him into agility training, but am not sure how/where to start.

Does anybody have any particular websites they can point out to me to get started or for good info? Competitions/clubs that allow for mixed breed participants? Even if I construct the props myself and just do it as something to keep him busy, I think it would be beneficial, but it might be fun to eventually try to compete with him in the future as well. I know his brain could use the workout!