Extra Extra Small Dog 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 the back at the hind quarters if standing measures 8 - 11 inches. It has 6" high quality polyurethane wheels, padded shoulder support, double thronged neoprene adjustable shoulder harness, and built in double rear adjustable padded leg harness. Both male and female dogs can still go to the bathroom comfortably in this rear harness. This cart can be used for assisted or partial weight bearing for neurological deficiency or weakness, rehabilitation of the rear legs. Also, if your dog is fully non-weight bearing on his/her rear legs the rear leg straps would also be used. Lightweight and non-corroding aluminum, very light and rugged. Adjusts with a hex wrench. Easy clip on front harness The cart adjusts in length, width, and height. If for any reason the cart does not fit, or if you want to return for any reason, we will refund the purchase price in full. We understand that sometimes things need to be returned and we stand behind and are proud of our quality dog carts. Specs: Lightweight adjustable aluminum frame (non-rust) Non-rust stainless hardware - very simple and quick assembly Deluxe neoprene front and rear harness for complete comfort Designed and tested by K9 Orthopedic surgeon Easy to adjust height, length, and width with a 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 polyurethane wheels with sealed bearings Easy clip on function of the front harness system This cart is good for: Hip Dysplasia Arthritis Rehabilitation Neurological problems like osteomyelitis or degenerative myelopathy Fractured spine/back Rear limb amputee 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