
This happened to one of the pups in my litter once, don't know if he'd got a little bit over excited whilst playing!!
It was actually the vet that noticed when they went to their check up - told me not to worry and it should still just fall out as normal. I informed the new family and said I would pay if there was any vet treatment needed if the tooth didn't fall out by itself when the new teeth came through. it was never mentioned again and the pup is 18 months old now so I'm guessing there was never a problem! :-)