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title: Why Do Dogs Sniff Each Other&#x27;s Butts: Science Video Explains
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# Why Do Dogs Sniff Each Other's Butts? Here Comes the Science

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by 

[Samantha Grossman](https://time.com/author/samantha-grossman/)


## Samantha Grossman


Jul 30, 2014 2:50 PM UTC

by 

[Samantha Grossman](https://time.com/author/samantha-grossman/)


## Samantha Grossman


Jul 30, 2014 2:50 PM UTC

You know when you see an otherwise cute and perfect dog with his nose just straight up buried in another dog’s behind, and you’re just like_, seriously, dude, why?_ 

This [new video](https://www.youtube.com/watch?v=PZlJ8XfwiNg) from the American Chemical Society explains the science behind this seemingly peculiar behavior — and why the smell doesn’t overwhelm them.

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