The cart was nearly completely put together when it arrived. When I finally sat down with the instructions, and laid out the remaining parts, it all made sense.
The cart is really an amazing little feat of engineering and design. The length and height can be adjusted to a certain extent. The piece that fits over the shoulders, to contain the corgi, lifts up to allow easy access.
Zorro needs to be in the cart in order to determine the necessary adjustments. So far, though, he isn't having any part of it.
Tomorrow, we'll see what food and treats will do to change his stuborn Corgi mind!