Our Lucky is in need of a cart, or wheels. Has anyone had experience with a dog on a cart? I know it is more humane than having him drag his hind end around, but I worry that once he is mobile again he will run over the cat and the other corgi in his exuberance! He used to be our herder and ball player, and I would love to give him back that ability if that is possible. We live in the country, so he has been quite isolated lately. Any information would be helpful, all the vets say is that he needs a cart.