Proper fit of your cart start with accurate measurements. There is nothing more discouraging than either producing or receiving a cart that is not usable due to poor measurements. Please take the time to be accurate as possible—call for help if needed. Much of our recent redesigning has been directed at enhancing adjustability. Width, height, and length are adjustable on all our K-9 Cart dog wheelchairs allowing for some error. Should you receive your dog cart and find that one or more measurement is so far off that you cannot increase or decrease the width, height, or length, this can be easily corrected by exchanging components, if necessary.