If you’re happy and you know it wag your tail By Holly Monsen This Great Dane knows exactly when to wag his tail for the song! This is so cute! Watch here COMMENTS FacebookTwitterPinterest 3 Million Dogs, Cute, Dogbookbest animal videos, best dog video, best dog videos, Cute dog videos, cutest dog video, cutest dog videos, cutest puppy video, dog, Dog videos, dogs, Funniest dog video, funny animal videos, Great Dane, Great Danes, If you're happy and you know it, Tail, Tails, Wag, Wag tail, Wag Tails, Wagging