I am interested in doing some agility type stuff with Tucker. He's fast and athletic and I just think he'd enjoy it a lot. I have no desire to ever compete. I just want to set up some agility stuff in the backyard (likely homemade as the aquiptment costs a lot) and run him through the obstacle course. However I want to make sure I'm doing it safely. He is 6 months old, what can and can't he do? What things do I need to teach him before letting him run on certain obstacles?