Let it out
Sometimes when I'm alone or if I'm with my dog and no one else is around, I act like a wild animal. I like to snarl and growl to myself and if I'm with my dog we bark at each other and play-fight.
Sometimes if I'm with a bunch of friends at one of their houses for the night and we have spread mattresses on the floor, I will go for one of them. It will generally be the one who gets scared the most because it's fun leaping on him and snapping my jaws trying to bite him. I'll growl and snarl at him and he will shout for the others to help him but they won't because they find it funny. Often I will start to drool halfway through this, adding to the whole 'mad dog' look.
I really find it relaxing and an emotional outlet to act as an animal and I can socialise with dogs and such like much better than most other people simply because I immerse myself in their world so much.