Obviously many of you haven't had to remove porcupine quills from a dog .... it takes to guys to hold the dog down and one to pull quills from the dogs face, mouth and throat with a pair of pliers ....and if you don't get them out properly or miss one,the quill will work it's way into the dog and will eventually kill it . Porky's also girdle tree bark which will destroy a tree . Anyone who has a cottage in the north will also know how much damage they can do .