It never says in the books or films what breed of dog Sirius in his animagus form is. He is a big, black shaggy dog. Looks a lot like the grim.
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Moony is Remus Lupin- who is a werewolf Wormtail is Peter Pettigrew- who is a mouse Padfoot is Sirius Black- who is a black dog Prongs is James Potter- who is a stag
He is otherwise known as Padfoot by James, Peter and Remus. His code name in the Second Wizarding War became 'Snuffles,' because 'Padfoot' was too risky (Peter would recognize this).
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.
NeapolitanMastiff
a pitbull