Book excerpt: It's been said that you shouldn't make the mistake of treating your dogs like a human, or they'll treat you like a dog. Nevertheless, lots of pooches are picky eaters or couch potatoes, as well as best friend and confident. In MY DOG THINKS HE'S HUMAN, a veterinarian offers ideas for keeping dogs active and content, without offering them the master bedroom. From choosing a puppy to training Rover to ignore the postman, here are a vet's best tips and tricks for keeping a happy, healthy pet.