Chihuahua or Pekingese, 6 letters
Chihuahua, e.g., 6 letters
Maltese, for one, 6 letters
One sitting in your lap, perhaps, 6 letters
Pomeranian, e.g., 6 letters
Poodle, e.g., 6 letters
Pug or poodle, e.g., 6 letters
Very small pooch, 6 letters