The three-headed dog was called Fluffy. Although it was featured in Harry Potter and the Philosopher's Stone rather than Chamber of Secrets.
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There are two dogs introduced in Harry Potter and the Philosopher's Stone.Fluffy is the three-headed dog guarding the trapdoor on the third floor corridor, and Fang is Hagrid's pet dog.
Hagrid's hellhound, Fluffy, is an allusion to the Greek guardian hellhound Cerberus, who guarded the Underworld, as Fluffy guarded the Sorcerer's Stone.
It has three heads (if you mean Fluffy).
Harry thought Snape had tried to get past fluffy and used a troll to distract the school.
Fang is Hagrid's dog. He makes his first appearance in Harry Potter and the Sorcerer's Stone when they go out into the Forbidden Forest to search for a unicorn. It is also said that he looks menacing with sharp teeth but he is actually really friendly