Thank you for viewing. This is a seatbelt specifically for dogs. You can use it by attaching the loop part to the headrest. It prevents your dog from jumping out of the car, especially if they like to look out the window in the passenger seat! I bought this for my dog, but he's not interested in looking out the window, so I haven't had a chance to use it at all, so I'm selling it. It's unused. Perfect for safe and secure drives with your dog! It also seems like it could be used with a dog cart. Red is also available. Please let me know your preferred color. There are multiple of each color, so please inquire about bulk purchases. Thank you.