Dog Wheelchair for Ultra Small Dog (Size 1) By Huggiecart. Approximate Weight 9 Lbs or Less Huggie Cart Dog Wheelchair for Ultra Small (size 1) Dog weight 9 lbs or less. (Belly to ground measurement less than 7") Adjustable in length, width, and height. We have more sizes available to fit your dog at Huggiecart Neoprene Chest Harness, Adjustable to fit. Rear legs stirrups included Light Weight Aluminum Frame, Premium flat proof wheel with bearings for smooth roll Find the right size for your dog then further adjust the dog wheelchair in length, width, and height for best fit.