"Masur: My character's defining characteristic was that he wasn't really interested in people, but rather loved working with dogs. I got the idea for the character's personality from working with Jed the wolf-dog. There was a little room off to the side in the sound stage. During the rehearsal period, dog trainer Clint Rowe brought Jed the wolf-dog in to get him used to the sound and smell of people. He was a young dog, so he was very jumpy. I worked with Jed and Clint for an hour on the first day of rehearsals and every day after that. It worked out very well during shooting, too. Jed would come and stand next to me, and he wouldn't do that thing that dogs do where they look back at their handlers. If you watch the scenes between us, he's never looking at my hand for a treat. He's just there with me; he's making his own choices. That’s what makes his performance so spooky."