Why do dogs put their heads in your crotch?

4. Putting Their Head In Your Crotch. … The simple reason is that crotches and armpits are the locations of human apocrine sweat glands, which periodically secrete sweat and pheromones.

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Why does my dog smell my crotch when I’m on my period?

Women who are menstruating or who have given birth recently (especially if they are still nursing their child) will also often find dogs impolitely sniffing at their private parts region. When a female ovulates this also seems to cause a change in pheromones that attracts dogs.