Tim Allen was born to play a dog. He's been practicing since before he became a TV star - the growling, the panting, the crotch fixation.
Disney's remake of The Shaggy Dog uses Allen to great effect in a comedy about a workaholic dad who has to be bitten by a magical dog and become canine to find out the truth about his family and the real villains in a trial he is in the middle of.

