Here is Lupin in his crate trying to get attention after he had a great play time
Now he's mid lick of his bars (which I personally would think might hurt)
second lick of the bars except this time his lip goes up exposing his teeth, thus turning him from looking like a friendly puppy to a rabid dog
and now he's on his third lick and has only one side of his lip stuck up.
My puppy is a down right goofball, don't be fooled by my pictures