- Health Library
- PetMD U
1. Bill or Billy. Billy for a puppy, Billo for a grown dog. Bill was the name of Kevin Costners Companion Mule in the movie, "The Postman". The mule was trained to hold a wooden sword as the Postman recited a Shakespeare fight scene! In the aftermath of a world changing (war) event, fallout made water unsafe to drink. In the movie, Bill started drinking from a puddle and the Postman, Kevin Costner screemed at Bill in a fearful and worried manner. Fearing that his steed consumed poisonous water, Kevin performed a water test and found that it was barely safe. Keven said to Bill, "You're not picky Bill. That's what I like about you!"