Abstract: A device allowing a quadruped animal that is disabled in the hindquarters thereof to move about, while automatically moving the hind legs of the animal. The device includes: a chassis, on which two side wheels are mounted; a rear harness for receiving and supporting the hindquarters of the animal, which harness can be supported by the chassis; and a crankshaft-type driveshaft having two crankpins to which are attached cradles for moving the hind legs of the animal where the driveshaft is shaped so as to move each of the two hind legs of the animal synchronously in phase opposition. A transmission device is configured to control the rotation of the driveshaft from at least one wheel.