I Was Crying About This, But Everything Is OK Now
Anyway, in Canada as in other parts of the world like Wyoming, there are porcupines.
Porcupines have quills attached to their tails. When they get anxious or fearful, they use their quilled tails to fend off their would-be attackers. The result is the quills dislodge from the porcupines body and lodge in whatever gets sprayed by the porcupine's tail. It's a common misconception that porcupines shoot their quills.
I came across this picture of the aftermath (taken in a vet's office) of one very relentless pitbull's "interaction" with a plucky porcupine. I found it more fascinating than repulsive, but it is pretty amazingly horrifying, so click with warning. Some of you will cry like I did. Others will be less affected. The dog is absolutely fine. Apparently, the process for extracting quills isn't too hard. Mostly they don't get too deep in the skin. This dog had some stitches and has fully recovered. Here's the picture.
And now, something to cleanse your mind of that image: Ahhh....