It serves a purpose—and if it happens a lot, something could be amiss. If a dog is shaking their head, there's likely something bothering their ears. Because they lack opposable thumbs ...

You’re going to be OK, all right?” the man filming reassures the terrified dog, his voice shaking as he pats its head. Three massive wildfires are currently tearing through the Los Angeles area.

For instance, they might "smile" when they're happy or give you those unmistakable "puppy dog eyes" when they're sad or seeking attention. But what does it mean when they shake? There are many ...