This is Dr. Christian. Welcome to JustAnswer. At this point it isn't necessary to take him to the vet. You can apply some corn starch to the toenail. It will help it clot. After that apply some triple antibiotic ointment and wrap his foot (not tight) to keep the nail covered. An ice pack over the top of the bandage will help with pain and also improve clotting. Change the bandage and clean the nail twice daily with tepid water. If he starts to act more painful or the nail becomes swollen or reddened then have him seen by a vet. After several days of treatment the nail bed should toughen up some and the bandage can be left off. The safest over the counter pain medication is aspirin but in this case it worsen his ability to clot and make the bleeding worse so you'll have to rely on the ice. If you have more questions please reply back.