What is the name of the three-headed dog in "Harry Potter and the Sorcerer's Stone"?

I love Hagrid, he is alot like me when it comes to animals that need help. Whether it be mother, vet, nurse, teacher or anything else they may need. No matter what kind of animals they happen to be.

baymax, I think the name Fluffy was meant to be humorous and/or ironic.

Hagrid yipeee