Best Friend Mobility Extra Large Rear Support Dog Wheelchair Specs: Lightweight adjustable aluminum frame (non-rust) Stainless steel hardware Designed and tested by K9 Orthopedic surgeon Easily and fully adjustable Allows pet to use the bathroom while in cart All terrain pneumatic wheels with sealed bearings Common conditions that require mobility aids: 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 Our dog wheelchairs are currently for pets with normal front leg strength. Although it is possible your pet will take right to the wheelchair, please note that it takes most pets between 1-2 weeks to grow comfortable with their new wheelchair.