This Dog Is So Happy He Wags His Tail In His Sleep (VIDEO)

WATCH: Meet Frank, The World's Happiest Dog

Think you're happy? We bet you're not as happy as Frank the dachshund here.

Adopted by Rafael Borges when he was in a very bad way, Frank is so content with his new life that he now wags his tail even when he's asleep. No, really. Just check out the adorable video above.

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