When it happened to mine, I kept it in the house for a few days to keep it clean and dry while the skin in the nail area hardened up and dried out. The bitch kept it clean herself - you know what it's like, you can't stop them licking at it. Just had a wee check there, there is now a wee hard stumpy nail now, not much beyond the toe. I think mine damaged hers jumping out of the car which she jumps out of every day in life - just one of those things!