In this corner: Horse! and in the other: Cow!

In my distraction earlier, I stumbled across a slight problem. I was watching something and it referenced eating horses. And I thought..."why don't we eat horses?" Of course, the obvious answer that came to mind was "oh but they're like pets, we domesticate them and they live near people on farms." But that doesnt' work. Cause we do the same thing with cows and chickens. Technically they're just as domesticated as a horse or a dog.
So yeah... now its got me thinking.. and I'm not sure if I'm thinking a) its okay to eat horses and we should be eating them (this then carries with it that, if we eat horses, we should eat cats and dogs) or b) we shouldn't be eating horse, and we also shouldn't be eating cows or chickens.
Hmm...