Dog

Dogs are small, docile animals. If a cat is nearby, it will attack it (Though it will not win). They guard bones. This particular dog is a Beagle.

Scribblenauts Unlimited seems to know many dog breeds, including:
 * Sheepdog
 * Labrador
 * Alsatian
 * Cocker Spaniel
 * Great Dane
 * Bulldog
 * Poodle
 * Labradoodle
 * Dalmatian
 * Doberman
 * Dachshund
 * Bull Terrier
 * Husky
 * Afghan Hound
 * Basset Hound
 * Bichon Frise
 * Chihuahua
 * Golden Retriever
 * Corgi
 * Yorkshire Terrier
 * Pomeradian

And many more.