We got butterscotch as a puppy and trained the chase instinct out of her by playing fetch (okay to chase a ball, not okay to chase cats, dogs ect). She took to training very well and can do several basic tricks for praise alone. She is very lean and active, seriously the fastest dog playing fetch I've ever seen, we get compliments on how fast she runs everytime we go to the dog park. The biggest problem is that she is so driven in playing that she blew out her left ccl (dog's version of the acl) which required a 6k dollar surgery a year ago, she is fully healed from that operation and it doesn't seem to have slowed her down at all, however recently she seems to be limping on her right leg and we are afraid that she may have blown that one out as well. We have seen other apbt have this problem too, I'm assuming it's their excessively high energy level and their ability to ignore pain when in play mode. I will be looking for another labrabull in the future, despite the ccl problems she has just been so great with everyone she meets, especially our little nieces and nephews who like her have that limitless energy to play together.