Fang the Boarhound
"Ah warn you, he's a coward..."
Fang is Hagrid's pet and companion. He is an enormous black boarhound (PS8, GF13) with a booming bark (CS15). The boarhound is another name for the Great Dane. Boarhounds have a reputation for being gentle, even with small children, even though they earned their name by being used to hunt fierce wild animals such as boars and stags.
Fang comes off as a rather scary beast but, true to his breed, is at heart a coward. He seems to like Ron particularly, even licking his ears when they first met (PS8). Fang lives in Hagrid's cabin with him. Fang's basket sits in the corner of the cabin's single room.
Fang accompanied Harry, Hermione, Neville and Draco into the forest for their first detention. He isn't really much help, however, since he ran away from things. Fang demonstrated a little more gumption when Lucius Malfoy visited Hagrid's cabin. Then Fang growled menacingly (CS15).
When Hagrid was locked up in Azkaban, Harry and Ron looked in on Fang at least once. They took him along on another foray into the forest following the spiders, and once again the boarhound didn't prove to be worth much as a protector or guide (CS14).
NOTE: In the films, Fang is incorrectly played by a blue Neopolitan mastiff. Thanks to Kelley Gary for identifying the breed for us.