I have been building wheelchairs for dogs for over 7 years. About 4 years ago I developed a NEW AND BETTER design to assist dogs that have problems with their hind legs. This is the ORIGINAL design using aluminum tubing, light weight plastic, neoprene rear support and a pneumatic wheel, the lightest on the market. This wheelchair is user-friendly for both you and your pet. Made with durable materials, the wheelchairs will withstand wear and tear under normal conditions.