The next day we went for a drive, so I could 'dispose' of it. During the drive Jack fell asleep, which made it even better timing. Jack has a tendency for getting upset whenever he is left in the car alone; he does this even if we leave the car to scrape the windows of frost, and he can see the person standing outside the car.
I wasn't sure how long to make it, but I think it does the trick.
It even matched the color of the car.Anyways, here it is!