I purchased Hercules a car set yesterday at lunch. I paid $24.00 for it at Super Petz. Best investment I have gotten so far. It is very easy to install. He would shake and wimper the whole time we were in the car. Now he is up high enough to see out. It has a hook to attach his harness to it. We laughed so much last night when he took his first ride in it. No shaking, no crying, just watching. When we would come to a red light I would lower the window and he was having fun. Of all the things I have purchased this is the best.