Pheromones. The scent of death is more spread through moving a corpse around and that wards of further intruders. But, if you're looking for a concession I'll give you that domestic animals differ from wild animals greatly in lifestyles and methods of hunting. I'd contend that exposure to the luxuries of being domesticated (aka exposure to humanity) has caused many of these animals to pick up traits that aren't present in nature.
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"The courts that first rode the warhorse of virtual representation into battle on the res judicata front invested their steed with near-magical properties." ~27 F.3d 751
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