i can't blame anyone for thinking that come to think about it. there's a special word for girl dogs and for boy cats and none for boy dogs (that we commonly use- a boy dog is a cur) or for girl cats. we don't think of sheep as all the same sex because we use a special word for each sex. we do it with goats too, they can be billy goats and nanny goats. on another matter it's funny how many animals have human names. billy goat. tom cat. jenny wren. robin. anyway. ah but what's a female cow, those are just cows. like cats it's only male cows that get to have a special name and we don't think of them as all female, you can have male cows differently from how you can have 'male cats'. unless the animal's called something else besides cow