system
Given the following post, respond as if you're commenting on Reddit:
human
Why do dogs smell so bad when they get wet?

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gpt
Dogs, among many other animals, produce an oil called Sebum from Sebaceous Glands attached to hair / furfollicles. This oil protects the animals skin from cold and dehydration, among other things. It saturates the skin and fur within 48 hours after cleaning (Even using Shampoo designed to stifle 'Wet Dog' smell) and will collect bacteria that breaks it down.
It typically does not emit a strong odor until it comes in contact with water, which activates it.
This "Wet Dog Smell" is more common in hunting and cold-weather breeds, and less common in other breeds.

Even more five year old friendly: Basically they get Body Odor just like we do but only when they get wet cause dogs don't sweat.