It doesn't have horns, not even stubs, and I can't spot an udder - so even though to me she looks like a cow, I'm guessing this is a bull. Do cows ever not have udders, and do bulls ever not have horns?

And no, I never said "she looks like a cow" to his face - that would have been mean (and, despite the barbed wire fence, I wasn't sure that he couldn't get to me). ;)