TailWaggers Medium Dog Wheelchair for Back Legs | Adjustable Mobility Aid | All-Terrain Wheels| for Pets That fit a Border Collie,Golden Retriever Dog's SizeBrand: TailWaggers Color: Blue Features: Happiness Delivered in Minutes: Folds flat for car storage; quick clip harness lets dogs "ear perk up, tail wag" on their first tryproven emotional revival in 90% of user cases Life Changing Mobility: Restores joy of walking running for dogs with hip dysplasia, arthritis, or paralysis (e. g., 100 lb German Shepherds regain 1 mile daily walks) Patented Tri Adjustable System: Customize height, width, and length