semlin
curmudgeon
I'm not sure if that is true, but I think a dog would rather live a shorter more fun life playing frisbee and stuff, than live a couple of years longer and but never get to play when he/she is young.
i don't have a dog, but a vet once told me that jumping for frisbees or keeping up with a mountain bike on a rough trail is very hard on a dog. they love it, but it ages them like playing professional football does for a human.