see now the flyball training is definatly differnt from here lol flyball starts when you bring the pup home and jumping starts when the dogs recalls are solid, not rel jumps though, we use the 1 inch sticks that are used for making jumps higher, and we just set up the sticks that way the dog gets used to having to go over something and aovids a futer problem of the dog going around real jumps, reals jumps starts around 8 months and box work starts early, around her we do aim for dogs to be competing on there first birthday, we have never had a problem with it hurting pups either and the same dogs easily race past 11 years old without a problem, I see young puppys in agility all the time as well. I mean nobody does anything that would seriously injure a pup, but thats the wya things are done here and nobodys ever had a problem lol