That wasnt high impact, I have seen a lot of that kind of puppy imprinting. Nice obstacle course.
I have seen Mal pups that age sent to swim across a body of water with fire/smoke pots floating in it with a decoy waiting to give them a bite on the other side.
Heard of another euro breeder that has a lot of high end mals that takes her pups out into a lake in a boat and dumps them over the side so they have to swim for shore.
OK, I got to ask this. What does dumping pups over the side of a boat to swim for shore accomplish? Only the strong survive? I can see it maybe as good low impact exercise, but that's all I can think of.