I like any commercials with animals in them, especially dogs. But two come to mind that I will always remember: Budweiser Superbowl about a man training a Clydesdale horse and they reunite years later ..... and dog keeps running away to be with his friend, a horse.
https://www.youtube.com/watch?v=WuAAXCOUH6Qaway
https://www.youtube.com/watch?v=7p_3lITiK_Q