How can you determine if a cat is a boy cat or a girl cat and what are the key differences to look for?

To determine if a cat is a boy or a girl, you can look at their genitalia. Male cats have a larger distance between the anus and genital opening, and their genital opening is shaped like a small circle. Female cats have a shorter distance between the anus and genital opening, and their genital opening is shaped like a vertical slit. These are the key differences to look for in determining the gender of a cat.