Petmate Bottom'S Up Leash one size fits all, Blue Harness and leash system for helping lift injured pet&#65533;s hind legs Transfers weight to front legs while hind legs recover and rest Harnesses wraps around dog&#65533;s abdomen to support injured or elderly hind legs Neoprene and nylon construction for optimal durability Non-chafing pads protect dog&#65533;s belly