A mobility assistance vest can be easily donned by placing the vest inside up under the dog, then pulling the right and left side sections together over the top line fastening the Velcro strips, and then pulling the chest section by the front shoulder straps through the front legs and securing the shoulder straps to the side sections on either side of the neck. The semi-detachable handle straps at the front legs are then crossed to the opposing side and attached with a snap to D-rings on the shoulder handles for the human handler to provide counter weight or upward support as they both descend the stairs side by side. Alternatively, the detachable handle straps at the front legs can be attached with the snap connector to the D-rings on the rear section of the vest to provide support for assisting the canine while ascending stairs, walking and standing up.