He even has a cowboy hat. It's an interpretation given that the vest is a dalmatian print instead of a cow print. Linus doesn't have a snake in his boot, or boots for that matter.
After some intensive training to teach him to say trick or treat, we went out into the neighborhood. It turns out it is relatively easy to teach Linus something when there is an immediate reward of candy during the process. Finally Lynn and Linus devoured the take.