I was at an agility trial last weekend and saw a Corgi in a great looking rear end wheelchair. My 13 1/2 year old is getting weaker in her back end and I would consider such a apparatus if she was not in pain. According to Reuters, handicappedpets has just developed the first fully adjustable wheelchair for dogs. If you have a dog who is losing muscle mass in the rear or having trouble with their legs, check out this website and others that offer the same type of product. I truly like the mission statement of handicappedpets.com.