Chihuahuas are famous for being the smallest breed, but there's a whole lot of dog in these tiny little creatures.
In fact, these dogs are also known for having a bit of an attitude.
They are extremely loyal to their owners and many times have difficulty playing nice with other animals.
They don't call them ankle biters for nothing!
I guess when you're the tiniest dog in the dog world, you have to develop some way to protect yourself.