It's not weird at all, Anna. In English, cats, dogs, rabbits and so on are usually called 'he' or 'she' if they're pets. When you go to the vet's, the vet will always use a gendered pronoun. If you know the gender of the pet, you'll always say 'he' or 'she'. If you get into conversation with a stranger walking their dog in the park, you'll wait for a clue from the owner that tells you whether their pet is male or female, and that will tell you which pronoun to use. The owner would be quite insulted if you referred to their darling doggy as 'it'.