The pig that runs the weapons shop (and the identical-looking pigs outside) ask for Hound's Teeth, but whenever I try to sell, there is no option to give the Hound's Tooth to the pig at all. I can only sell them stingers.
1. Find weapons pig. 2. Hover Hound's Tooth over them. 3. Behold the complete and utter lack of a "Give" prompt.