The Shaggy Dog (2006)

Hairy adventures begin as unbeatable Deputy D.A. Dave Douglas takes on his latest legal case--this time involving a criminal animal laboratory. It's yet another ambitious assignment that will whisk workaholic Dave away from his wife and kids, who yearn for his attention. But when Dave is accidentally infected with a top-secret genetic-mutation serum that morphs his body into that of the family's new pet Bearded Collie, everything he thought he knew about being himself and a part of his family changes. Now, with his perked-up ears, and his front-row seat on the household carpet, Dave is able to gain an entirely different perspective into his family's secrets and dreams. Inspired by what he discovers, Dave wants nothing more than to stop fetching and return to fathering--only first he'll have to stop the evil genius behind the serum--in a literally wild chase that will finally give him a chance to become man's--and his family's--and best friend.