http://pets.webmd.com/dogs/my-dog-shivering-trembling http://pets.webmd.com/dogs/my-dog-shivering-trembling http://pets.webmd.com/dogs/my-dog-shivering-trembling WebMD: Perros sanos; mi perro está tiritando o con temblores Pet MD: Dog Shivering or Trembling WebMD: Dog Shivering and Trembling -- Causes and Treatments WebMD: Dog Shivering and Trembling: Causes and Treatments