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There's not a lot you can do ,we found out by the same thing happening to one of our dog's claws.We cut the claw back as far as we could and left it to the dog,usually they will chew at it .It is possible to seal it with super glue but you have to be very careful that it dries before the dog goes anywhere OR tries to lick it! I don't think the vet can do anything.
Sorry I can't be more helpful,
The bigger danger is the nail may become infected and it could spread up into the bone. If there is no danger of infection then I agree with Howard that it will need to be sealed in some way until it grows out. If you have any doubts at all then consult your vet.
I had this happen with my little girl Teagan. We take our pups for rides in our motorcycle sidecars often but one day she pooed in the sidecar and decided to get as far away from it as possible. My husband slowed as fast as he could when he realized she was going to jump but was still going about 5 mph when she hit the ground. She was very lucky in that her injuries were just some road rash here and there but unfortunately some of her nails were ground down. One nail in particular had split longitudinally in two places down to the quick. I briefly considered repairing it with super glue but didn't because of the fear of infection. Instead I treated it with warm salt water soaks once to twice a day for a week. Little by little the quick healed and the broken nail bits started to fall off. I helped by trimming them as much as I could without hurting her. I have a medical boot too that I used when she ran outside to help keep it clean. It healed perfectly!