Doc would put cans of Kal Kan dog food on the automatic dog feeder, which it would open and then pour the contents into Einstein's bowl.
When Marty returned to Doc's garage in 1986, as stuff at Doc's garage were being sold, he turned it on, but there were no cans in the gripper arm. Biff Tannen used it to successfully open his can of beer.
- Back to the Future (First appearance)
- Back to the Future: The Game