Adjustable size dog wheelchair, with a design that allows for excretion. I only checked the contents after opening it, and it was too large for my parents' Papillon, so I stored it without using it. I assembled it once, but it has not been used. If there are any initial defects, please contact the seller. Thank you for your understanding. - Model Name: Dog Wheelchair - Size: M - Features: Adjustable length, height, and allows for excretion during use. Thank you for viewing.