Odds are decent you've seen this video of dogs shaking in super slow-motion (and if you haven't yet, you should – it's a slobbery good time). What you may not know is that there's actually some really fascinating science behind the wet-dog (and, more broadly, the wet-mammal) shake.
Last year, researchers led by Georgia Institue of Technology biologist David Hu demonstrated that the shake of a wet mammal – be it a mouse, a dog or a bear – is anything but random. In fact, they show that the frequency of an animal's shake (i.e., the number of times it oscillates its body per second) is tuned to "(i) the animal's size and (ii) the properties of water, namely surface tension and density." This way, the animal can remove a maximal amount of water with minimal physical effort. A large dog, for instance, can shed as much as 70% of the water in its fur in just four seconds.
Video credit: SHAKE by Variable, based on the photography of Carli Davidson.