How porcupine quills work

I think all 4 of my dogs have had a onetime experience with a face full of quills. None of them were anywhere near as severe as the poor dog pictured in the video, but removing them is very difficult because the way the quills are grown the tiny scaly surface of them will cause them to keep working their way deeper and deeper into the animal's skin. You have to be very careful when removing them so as not to break them off beneath the surface. I noticed on the very rare occasion when they encounter MR grumbles as we call him 3 of them will surround him on 3 sides while the larger dog will grab a stick in his mouth and use it to swat at him to chase him away. They are real good at chasing nuisance animals away or dispatching the stupid ones. I can tell by the way they are barking if I need to fetch a rifle or a shot gun for assistance. Farm dogs need a job and mine seem to take theirs to heart

How porcupine quills work - GIF