I will probably get one for my 9 yr old collie to help him walk farther, go faster to keep up with the young collie and me, and get more exercise. He is gradually getting weaker on the hind end but now it isn't so gradual, his decline is accelerating. DH said when he has seen dogs in wheelchairs before, he thought it looked cruel. Just wondering others' opinions on them and about what kind of experiences people have had with them.