It would be probably be alright to use Odie in agility but I doubt that you will be able to compete with him due to the fact that most of the agility orginizations in North America do not allow dogs that do not have the use of all of their legs, or dogs that are blind to compete due to the fact that it isn't always safe for them. But i think that as long as you keep an eye on him and keep the jumps at a low height (you'll most likely want to keep the jump height between 4 and 12 inches) he should be okay to do as just a fun thing. Just please try to remember that even with four legs all the running and jumping that's done in agility can put a lot of strain on a dogs body so keep an eye him.