Dog Wheelchair for Small Dog By Huggiecart. Approximate Weight 18 to 40 Lbs Huggiecart Dog Wheelchair for Small (size 3 R) Dog weight 18-40 lbs. (Belly to ground measurement less than 11") Aluminum Frame Construction (Huggiecart has all sizes for 3 lbs to 99 lbs dog) Neoprene Chest Harness, Adjustable to fit. Rear legs stirrups included Adjustable in length, width, and height. Premium non flat 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. dachshund-ish body type: We recommend size 2 (extra small) cart even though your dog weight around 18 to 25 lbs.