Agreed. I've no intention of ever giving up my carnivous ways, lol, but there is no reason that the animals we eat should ever have to suffer for that great privelege.
Both pigs and dogs were originally used to consume garbage and excrement in villages and camps in the distant past. Pigs are more efficient but were not available in North America prior to Columbus (which is why the indigenous populations had no immunity to Small Pox). Both pigs and dogs were considered survival food in hard times. As far as intelligence goes, humans have been eaten in many cultures throughout history worldwide.