Several years ago I was given an older cat whose elderly owner had died. He was a neutered male unfortunately named Kitty. When I took him to my vet for a checkup, he kept referring to Kitty as "she". When I told the vet's receptionist (who is also his wife) that I was sure Kitty was a boy, she said "He is a boy. My husband (the vet!) calls all cats "she" and all dogs "he"!" We laughed about it and teased him for years!