Ah, I had never seen the full picture!
And yes, in Spanish, we call animals "he" or "she" always. In English, most of the time, you say "it", but you can use "he" or "she" and it sounds more personal. It's not incorrect. I use both things in English. Usually, I prefer "he" or "she" after introduction (once the reader already knows if I'm talking about a male or female) and "it" if I'm speaking broadly.
To us, Spanish speakers, though, it does feel a little uncomfortable to use "it" for a pet or for a baby (Babies are sometimes referred to as "it" in English as well), but I know that if I suddenly come up with "he" or "she" and the English reader expects "it", they may have a feeling like "Who is he talking about?", so that's why I do it the way I described. Again, as far as I know, it's correct anyway.