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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
It sounds like he may have broke one of the nails. These can be painful and make dogs quite reactive. The treatment is sedating and trimming all the nails back. A broken nail may need to be removed from the base of the nail.
If you want to give something at home to take the edge off while you wait for your vet to open, you can give over the counter Benadryl. The dose in dogs is 1-2 mg per lb body weight. It can be given up to every 6 hours.
I hope this helps, let me know if you have any other questions.