THIS LISTING IS FOR AN EXTRA LARGE USED WHEELCHAIR! Deluxe Lightweight Aluminum Doggy Wheelchair From Best Friend Mobility. This cart is made to fit 98% of all dogs whose measurement from the floor to the top of their back at the hind quarters measures 23 – 29 inches. It has 14 all-terrain wheels, padded shoulder support, Triple thronged neoprene adjustable shoulder harness, and double rear leg EVO neoprene harness. It has a fixed, padded seat for comfort. The dog can still go to the bathroom comfortably in this rear harness. Lightweight and non-corroding aluminum, very light and rugged. Adjusts with a hex wrench. Lightweight adjustable aluminum frame (non-rust). Non-rust galvanized hardware (only 2 bolts required). Deluxe neoprene front and rear harness for complete comfort. Designed and tested by K9 Orthopaedic surgeon. Easy to adjust height and length with hex wrench. Pet can use the cart for assisted walking or full rear leg support with no rear leg weight bearing. Allows pet to use the bathroom while in cart. All terrain wheels with sealed bearings. Easy clip on function of the rear and front harness. This cart is good for. Nuerological problems like osteomyelitis or degenerative myelopathy. Ligamentous injury like PCL or ACL. Thoracic or Lumbar disc injury. Any other condition that results in rear leg pain or weakness. Your pet should have normal front leg strength to use this cart.