It's the thrill of the chase... your dog is always after that elusive tail of his/hers.
Round and round the pooch goes,. trying to desperately to lock it down. Then FINALLY it happens... the tail is caught by said doggie... YAY. Now what?
That was the case here. Pretty anti-climactic as this dog catches tail, stands till, looks at his owner and just walks out of the room with his tail in his mouth as if to say "OK... that's all I've got."