In the books, the characters call Crookshanks “he”. In the fantasy novels I've read, if a female character has an animal companion, it's almost always male. I haven't been able to come up with any examples of a female character with a female animal companion. I'm sick of this “male and female are complementary opposites” nonsense, so I've decided to go against the trend here.
I haven't specified exactly what the difference from the books is, though. Perhaps Crookshanks is a transgender female cat, and the only difference from the books is that Granger is perceptive enough to notice and respect that.
Approximate readability: 9.37 (483 characters, 102 words, 6 sentences, 4.74 characters per word, 17.00 words per sentence)