In this TED-Ed video, science writer Cara Santa Maria explains why wet dogs stink. She starts by describing the anatomy of a dog's fur and skin, and how it produces a waxy substance called sebum. Sebum helps to keep a dog's skin and fur waterproof, but it also traps bacteria and other particles that can cause a bad smell when the dog is wet.

Santa Maria also discusses other factors that can contribute to a dog's bad smell, such as diet, health problems, and environmental conditions. She concludes the video by offering some tips for keeping your dog smelling fresh and clean.

Some of the key takeaways from the video include:

* A dog's fur and skin produce a waxy substance called sebum that helps to keep them waterproof.

* Sebum can trap bacteria and other particles that can cause a bad smell when the dog is wet.

* Other factors that can contribute to a dog's bad smell include diet, health problems, and environmental conditions.

* You can help to keep your dog smelling fresh and clean by bathing them regularly, using a dog-specific shampoo, and brushing their fur regularly.