I don't see how you can make any logical argument that eating pigs (or any animal, really, but pigs are known to be very intelligent) is okay but eating dogs isn't, sentimentality aside.
I mean, look, I had a pet dog for many years. I'm not saying I'd have killed and eaten it. Of course I wouldn't. But if I had a pet pig (some people do!) I'd be similarly appalled at the idea.
I don't think it's really morally justified to eat dogs, no, but I don't think it's morally justified to eat any animal. I still do it, though, because I don't care enough to conciously change my diet. That sounds horrible, but I'd imagine it's true for a lot of people.
Thank you; this is my position exactly.