What was Sirius's name in his dog form?

What was Sirius's name in his dog form? - briefly

In the Harry Potter series, Sirius Black assumes the form of a large black dog as part of his Animagus abilities. His animal form is a Great Dane.

What was Sirius's name in his dog form? - in detail

In the Harry Potter series, Sirius Black is known for his unique ability to transform into a large, shaggy black dog. This transformation is not merely a physical change but also reflects Sirius's deep connection with the animal world and his Patronus charm, which takes the form of a dog. When Sirius transforms into this canine form, he does not adopt a specific name distinct from his human identity. Instead, his dog form is simply recognized as "Sirius in his Animagus form" or "Sirius's dog form."

The term "Animagus" refers to a witch or wizard who has the ability to transform into an animal at will. Sirius's choice of a dog for his Animagus form is significant, as it not only represents his loyalty and protective nature but also serves as a connection to his past and his friendship with Remus Lupin, who is a werewolf. By taking the form of a dog, Sirius can move more freely and observe situations without drawing attention to himself.

In summary, while Sirius does not have a separate name for his dog form, his transformation into this shaggy black dog is a crucial aspect of his character and abilities within the Harry Potter series.