Barely used before passing away. unit is completely assembled just need to adjust for dog! The Walkin' Wheels Dog Wheelchair is designed for dogs weighing between 70-180 lbs, specifically for the Labrador Retriever breed. This large size model provides support for your back legs, allowing them to move around comfortably and easily. The Walkin' Wheels brand ensures quality and durability in providing assistance for your furry friend's mobility needs. This unit quantity is one, making it a reliable and essential tool for dogs needing extra support for their hind legs.