They got this sayin here in Ak, not supposed to kill porkies cause some starvin soul could always catch one on the ground to eat.
I shoot everyone of them I see around the house, cause I have had them come right in my doglot and tangle with sled dogs, same outcome, me pullin quills with needlenose from up their nose and throat.
Now this is what your supposed to do with porcupines, barbecue them. Indians just luv them but they taste pretty foul & gamey to me. Indians gut (belly has fur on) and grandma burns quills off over fire as she rubs with stick. They like them kinda rare or raw I'd call it. Indians will take porcupine over white man's pizza everytime. 
I've never tried porcupine, but I wouldn't be adverse to it (once the spines had been removed, thank you). I don't imagine it would be too different from groundhog/woodchuck/whistle pig, and as a PA native, I've eaten plenty of those.
Yup...been there, done that with my daughter's stupid Dalmation. It took 4 of us to hold him down and pull the quills out of the roof of his mouth. We used that baby antiseptic called Numzit to deaden the pain and needle-nose pliers to pull the quills out. Bad part is, the stupid dog did it again two weeks later. He also turned out to be a serial chicken/duck killer. We came home one day and he had massacred 6 chickens and 2 ducks, the feathers covered half an acre. Unfortunately, they were the neighbor's chickens and ducks so we had to give him away rather than see him shot if he did it again. Personally, I was glad to see him go.