Walkin’ Pets by Handicappedpets.com Walkin’ Scooter Comes with 2 part scooter (bag and base) and instruction card Size is Medium Easy to put your pet in; adjustable Velcro collar with adjustable Velcro strap, elastic band under the front legs, zipper closure on their right side, adjustable side straps Mesh panel helps keep them cool Simply put your pet in the bag, put the bag on the base, and attach Base has coaster wheels (thinks balls) and thick foam to stay comfortable NEW! Tried it with my dog once inside, but he was just a little too big for it. I’d say this would work for a dog around 15-25 lbs., similar to the dogs listed for the Walkin’ Wheelchair I sold. Check it out. *This is great for a senior animal or one with mobility issues (arthritis, hip dysplasia, etc.)!