I don't hunt any more, so i don't know if what I'm about to say is still true or not. Now, that being said, the regs used to define a fawn as a deer who's horns had not yet protruded the hair on the scalp, and I don't recall any mention of a length of horn. If any buck was legal, maybe an investigation into a fawn definition is in order. Any way you slice it, that was a mighty small deer, and it seems that one would have to be awfully close to it to be able to see those nubs of horn. Sure hope it wasn't a "shoot first, look later" thing.