Hello Itasan It might easily have been "his" in the BrE version too. I would say that as a general rule in BrE, "it" distances the speaker from an animal, while "he/she" indicates a friendlier attitude. Though of course the latter is only possible if you know the animal's ***.
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ItasanOh, I see Itasan... That's the owl that brought Hagrid his newspaper...
Thank you very much, everybody. This is the owl that delivered a paper.
UK Version: Harry Potter and the philosopher's stone, p. 72
US Version: Harry Potter and the sorcerer's tone, p. 62