tomtom94 said:
As a vegetarian, all of them.
But to look at the wider picture (and try to not get flamed), why should you not eat any particular kind of meat? It's all just animals.
To take the OP's example: why not dog? Other cultures eat them just the same, and it's not like they do anything for humanity any more (except pets)
It's environmentally and economically impractical to raise second-order consumers (carnivores especially) for food because you have to feed them more than you get out at the end. With cows and sheep, they consume producer-level life-forms which we ourselves cannot eat due to the excess of, to us, undigestable cellulose. This way cows perform the role of converting plant matter we cannot eat into animal matter we can.
As to the topic, it would depend on the circumstances I was in. Currently I try to avoid pork and hams because I think that the conditions most pigs are kept in are atrocious, just as I avoid non-free range chicken and beef. However in the circumstances of starving or having limited money, I would be forced to lower my standards. I'd consider human, dog, etc if, for example, there was absolutely no alternative and I was going to die otherwise, due to crops being destroyed by war or environmental crisis.