A cart is a vehicle with wheels that's pulled by an animal, a person, or by another vehicle. You could attach a cart to your dog and teach him to pull it around.
The typical cart is hooked up to a draft horse or another farm animal. Other kinds of carts include hand carts, which can be stacked with heavy items and easily pushed or pulled by people; and golf carts, which are open vehicles that are powered by electricity or gasoline. When you cart something around, you lug it or transport it. The word cart comes from a Scandinavian source, probably the Old Norse kartr.