We did notice that some people commented that their dogs were too excited to sit still in a dog car seat. This was probably because they were older and had not been trained to sit still in such a seat. if the older dog is a calm dog that ideally has a pet bed in the home that it likes to get in, then it may work out in the car as well with the car seat. you never know until you try. It would be unfair for anyone to tell you that it would or would not work out until you try it yourself.