Why do dogs spin around before they lay down?
Wild dogs had to pat down tall grass and underbrush to make a comfortable bed for themselves and their pups. When domesticated dogs spin in a circle before bed, it's just a leftover instinctual behavior from their wild ancestors.
Dogs circle to release their scent to serve as an aromatic alert to other dogs. It serves as a signal that this bed belongs this dog and this dog alone.
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