Dog or person - the only available. It looks like a model of a production line platform, to me - something to move tools or materials or product back and forth along a bench, wall, aisle, etc. It doesn't steer.- - - -
meanwhile, I have often wondered about the ceramic "cart" from pre-columbian america(post 54)
who or what pulled the cart?
a person?
a dog?
a llama?
What that model looks like: a hand moves it, using the dog as a handle.