Here I have for sale a Dogmobile mobility aid for medium to large dogs . The aid is second hand and would have cost Around £200 from Dogmobile when brand new . We brought it for our Border collie who at the time was losing the use of her rear legs the mobility cart supports her back legs but does not take all the weight so the dog can still exercise there back legs if they still have full use of them. our dog can no longer use it as her front legs are going weak now and cannot support all her weight . The frame is fully adjustable for length and height and the harness and straps are all adjustable and cushioned were needed. You can go to there web site at www.dogmobile-online.com for more information and they have some measuring charts on there as well ,this aid was meant for dogs like large collies ,alsations,gsd ,labs,boxers,dalmations and any dog of that sort of size .They recommend it for dogs recovering from injury or major operations as a part of there rehabilitation as most of the weight is taken of the rear legs and allows them to walk without constantly falling over.