Diy Dog Harness To Support Back Legs . If your dog has fallen in the past due to leg weakness or lack of stability, these types of harnesses can be a great option to help keep your dog mobile. Diy dog rear lift harness. Dog Lift Support Harness Pet Back Legs Lifting Adjustable Dog Recovery from www.amazon.co.uk Cut 4 12 pieces from the remaining strap. Open the bag and cut out the two small side panels. This harness helps by giving her a little boost to get up ledges, stairs, into cars.