When an accident turns him into a dog, Dave must find a way to become human again, all while learning what it really means to be man's best friend. In this case, the human is Dave Douglas, a lawyer whose passionate practice of arguing in courts have alienated him from his wife and children.

Deputy D.A. Dave Douglas (Tim Allen) spends more time at work than at home with his wife and kids His latest case involves an animal laboratory, and when Dave is infected by a top-secret, genetic-mutation serum, he turns into a replica of the sheepdog that bit him. Now, Dave sees life from a different angle and gets to understand his families' hopes and dreams. Shaggy Dog is a comedy fantasy that puts new meaning into a dog being man's best friend. Tim Allen injects his good natured humour in this Disney remake of the 1959 film in which he turns into a sheepdog, and in doing so gets close to the family from whom he has distanced himself. The Shaggy Dog" is good, clean, silly fun and it aims directly for the family crowd.