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–10 votes
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"Because the odor is unique to every dog, two dogs can quickly determine if they have met before." Dogs sniff rear ends as a form of greeting and obtain vital information from the anal secretions.
–4 votes
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because its their way to know who you are and to say "hi"!

+4 votes
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Dogs have apocrine glands all over their bodies, but the highest concentration is found in the genitals and anus, hence why they sniff each other's butts. ... Dogs often greet a new dog with a quick sniff of their rear end.
+6 votes
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"Because the odor is unique to every dog, two dogs can quickly determine if they have met before." Dogs sniff rear ends as a form of greeting and obtain vital information from the anal secretions. ... And because the odor is unique to every dog, two dogs can quickly determine if they have met before.

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Welcome to The Dog Visitor Q&A [2022], where you can ask questions and receive answers from other members of the community.
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