Good grief. What was that dog thinking?
I'm guessing it's: "Ow. owow. ow. ow. ow. ow-ow-ow." Or, something like that.
I don't know why they do it either, especially after the first quill. I had a black Lab that did something very much like that. Dozens, if not hundreds of quills. One right through his tongue. Poor guy was miserable, but: he never licked a porcupine again.