About a month ago our little Sheltie, Dusty had a sudden paralysis to her right side. She has gained some use of her back leg but her front paw curls under and has no strength. So no more walks (until we discovered your product). She loves your pack and we are all so glad that she is joining us and our other Sheltie, Dexter on our daily walks. Thank you for your well thought out product. With the added booster block and all the adjustable straps we were able to fit her for a perfectly comfortable ride!