Chasing and running is good exercise for him, that shouldn't be a problem unless the bad foot gets caught somewhere. The ortho vet explained that keeping the tendons and muscles strong was essential to protecting the knee. But yeah, no good on the jumping games, although Poquita persisted as long as she could at trying to launch herself into Bud's arms. There is only so much you can prevent them from doing. Our learning how to put the patella back in place gave Poquita a lot of extra good years. I am reminded of one time at the park when Poquita was walking across the grass and started holding up a hind leg and crying. She had tears running down her face while Bud held her and I tried to "fix" her knee. It was a few before Bud noticed a bee stinger in the pad of her foot. :E Dang, He got the stinger out and then it was straight to the vet for a shot, I think an anti-inflammatory and benadryl. Poor puppy.