There are folk remedies and wive's tales about how to deal with porcupine quills, but doing it wrong could be very dangerous for your dog.
Let's Debunk A Few Myths About Porcupine Quills and Your Beloved
Porcupine - Wikipedia
Curious About Quills Smithsonian's National Zoo and Conservation
Let's Debunk A Few Myths About Porcupine Quills and Your Beloved
Creature Feature: North American Porcupine
An African folklore story of Why Porcupine Has Quills
Let's Debunk A Few Myths About Porcupine Quills and Your Beloved
Why the Porcupine Has Quills': Ojibwe winter story - Detroit Lakes
Porcupines: The Myth of Shooting Quills – Nature Blog Network
Animal Myths – Separating Fact From Fiction
Can Porcupines Shoot Their Quills?
Animal Myths – Separating Fact From Fiction
Do Porcupines Shoot Their Quills? (Fact Check) 4 Defense Behaviors
American porcupines are misunderstood but have superpowers.
Let's Debunk A Few Myths About Porcupine Quills and Your Beloved