The following is excerpted from a message from Hendy Lund to the LeoList, dated 26 May 1999. Agility training requires both concentration and coordination.
Puppies have neither.
While there's nothing wrong with playing games and passing a pup through a tunnel a few times, training on the contact obstacles and weaves should wait until the dog can concentrate more. As for coordination, imagine the following situation. You've been asked to walk a balance beam. After a couple of wobbly passes, you more or less get the hang of it, and are feeling pretty good about yourself. A week passes, then you're asked to do the balance beam again.