The dog wheelchair has a durable, light weight aluminum frame and adjustable harnesses to provide optimal comfort and mobility. **.Push button adjustability in height, length and width which enough for the dog. 3 sizes available ,please choose correct size according to hip height. Durable, lightweight aluminum frame; Easy for your dog to maneuver while keeping it stable Fully adjustable harnesses provide optimal comfort & mobility; Wheelchair adjustable in height, length, & width Dense foam wheels with rubber treads will not puncture; great for your dog to explore all terrain