Thor

"Come inside the mind of your best friend... Thor is a German shepherd living with a human family. He loves his family and takes his role as their protector seriously. But when Uncle Ted comes to stay, Thor finds his loyalties and instincts sorely tested. To Thor's sharp canine senses, Uncle Ted is clearly not entirely human. If the family could see and smell what Thor does, they'd realize Uncle Ted is in fact a werewolf, with an uncontrollable thirst for blood."--Amazon.com.