Anal glands, which secrete a foul-smelling liquid, are used for scent marking and identification. Because of their complex olfactory system which includes a component called Jacobsen’s organ in addition to their nose, they can also process scents that have no detectable odor like pheromones.

A butt sniff is the equivalent of a human handshake enabling dogs to recognize each other as individuals and identify sex, age, variability’s in health and social order.

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