I don't quit get your den thing, they are a slow animal, I don't think they are equipped to attack anything but DOGS that are trying to eat them. And I will tell ya ,if you have a dog that had messed with a pork it will do it again and over and over. Get yourself some pruners and some hemostats and pull them yourself as I have never heard of porcupines being a household problem. unless the dogs can't control themselves around them . Man up or take them to the vet, when they get in trouble, around here if a dog is running anything they will be shot and given a shallow grave, so keep that in mind also.