Since no one has answered, I'll just toss this out.
My vet/hunting partner did some tabletop toe surgery on a shorthair a few hunting seasons ago. The dog had a split nail that started growing back _inside_ the nail bed and was carrying that paw. Got all infected and swollen. The vet had to remove the nail, root and all, so it woudn't grow back then antibiotics. Dog was using the paw the next day but not hunting of course.
All I can say is keep an eye on it as it regrows and make sure it grows out normally because that was one ugly operation to watch.