It may have more to do with anthropomorphizing than anything - it's much easier for an urban dweller to project human qualities onto animals like dogs, which th

It may have more to do with anthropomorphizing than anything - it's much easier for an urban dweller to project human qualities onto animals like dogs, which they interact with frequently, than the slabs of pig meat they see in stores. A distaste for eating animals perceived to have more human-like qualities follows naturally from avoiding eating humans.