We just got back from another walkie - and mom was annoyed at losing my ball. We found it at the bottom of a big hill and just went for it - she in 2-wheel drive, me in 4-wheel drive - and got it!!!!! I guarded mom all the way up the hill (it just wasn't as easy for her as it was for me!) to make sure she made it, and I GOT MY BALL BACK!!!!