You don't cast the animal, per se. You have an animal...

You don't cast the animal, per se. You have an animal trainer who looks for several of them. That is a different experience than dealing with actors. That is just difficult. It is what you expect from an animal on the set. You just run a lot of film and prompt it to do the right thing, but sit through it doing all the wrong things first. It's just unbelievably boring, frustrating and painstaking to shoot.