Oh my gosh! Poor Will!! Quite frankly I am suprised that Harry remembered his lesson. My dad had hunting dogs and those fools NEVER learned. I can't count the times my parents held down the dogs and pulled hundreds of quills while I held my hands to my ears. I know exactly what you are going through. If the quills don't come out, they will work their way through and come out on the other side. Will's body will either disolve the bits you didn't get or they will come out on their own. For as bad as they look, I don't rememeber any of our dogs getting sick from the experience. The dogs just seemed more determined to get even with the porcupine the next time.

As far as Sadie goes, I was raised in the Canadian wilderness and if there is a pack of coyotes, yes, they will lure her away and kill her. If there is a lone male there, he may just try to mate with her, either option is not good. We had a dog that was half coyote and german shepherd, and when we had gone away from home for the day sometimes we would come back and see tracks in the snow where coyotes had come in and played with our dog/coyote. The same coyotes caught the neighbor's dog out in the field and killed it. Either way, I would keep a sharp eye on Sadie, and the boys!
Poor Will, I would be feeling sorry for myself too, poor puppy. Give him a hug from Gunner.
Joyce