I think, in general, people seem to think dogs are male. Not sure why. And, it used to be, before everything got so "politically correct", and it became "he/she", people referred to anything where the gender was unknown as "he." If I remember correctly, that was the "correct" way in English class. I still do that when I'm writing or typing or speaking although people think I am just assuming, when all I'm really doing is going by the way I learned in school, even if it is not as "PC"... I refer to everything as "he" unless or until I'm told otherwise. Or it's something obvious like a feminine name or color or something...but, even then, I've seen people put pink collars on male dogs. I know I'll sometimes just ask "is your pet male or female?" just to avoid annoying people. It has never bothered me in the past, though...my dog Bruno was small, so, I think that's why some people thought he was a girl, but, even then, that didn't happen often. I don't think anyone's ever asked if Finn was a girl...they just always call him a "him." But, it wouldn't bother me if people thought he was a girl.