There's a few ways to interpret that and answer. The why some animals and not others is more of a cultural divide. To my knowledge I've never consumed dog meat. I hear it taste...ok. I personally wouldn't seek it out, and that's an interesting question in of itself. Would I decline it in a survival situation, no. Would I decline if offered to me while in another country or something? Not sure.

The odd side effect of farmed animals is insurance of their survival as a species. Now, I'm not anti vegan. I don't think it's a bad idea. I'm omnivorous. Could we do better, ya. I've helped with the family farm before, growing a variety of produce. I've also hunted before. It would be nice to go back to a more primal way of eating. Having to work for the food beyond driving to a grocery store or having them delivered. Most of humanity has lost that connection to the land and life cycle.