I have a 11.5 year old that is still a bit of a clown. Sperm count is still in the 85% mobility rate and he can still clear a 6 foot fence if you dont watch him. I just want tips on keeping him this way as long as possible. I don't feed kibble and he get's some form of work everyday even if it's just me throwing the ball for him. He is one of the few Schutzhund III APBT's and has produced the same so he is very important to me and many others who are involved in the sport .