Julie - I agree, the SPIT makes the photo. Here are a couple of other big breed dogs playing the snarl game.
Big dogs play in big ways!!
The Mouth Game
This is one of my favorites. I love the look on the face of the bitch on the right (Cleo). These are 2 intact bitches. The bitch on the right (Izzy) can get an attitude, so I keep a close eye on her.
A winter basketball game between a dog and a bitch.