Thank you for viewing. This is a wheelchair/walker for dogs. It can be used with 2 or 4 wheels. The height and width can be adjusted to fit your dog. One of the blue rubber caps on the rear wheels is missing. I made a replacement using masking tape and sponge. There are no other missing parts or accessories. The size is S. Please refer to the size chart in the 7th photo. By the way, my dog was a medium-sized dog. (Male Basenji, around 10kg when in use) It was used for about 3 months, and only indoors. The accessories in the bag in the 5th photo are unused. I hope this will help support your beloved dog's walking.