So?

Dog did dog thing. What other natural behaviors surprise you? "Holy crap, that guy just made a really weird noise with his ass!" "You mean he farted?" "What's 'farted'?"

Did your dog also lick its balls?

Then the dog died? What's the FML here

Yorkies and several other small breeds were bred to hunt mice.

Where's the FML? Many breeds of dog were bred to hunt rodents and small animals.

Maybe your dog is a Terrier breed? Many Terriers hunt rodents.

Reminds me of a full-grown Rotten Shepard catching a rat. It squeaked, so I thought it was one of his toys and almost picked it up. FML.

Let’s clarify something here: The FML isn’t about a dog killing a mouse, it’s about this person grabbing said mouse with his bare hands. Let’s stop with the “where’s the FML” nonsense — touching a dead critter when you’re not expecting to sucks. I know.