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Hello, this is Dr.Jess. I am sorry to hear about your pup! It can take quite some time (weeks to months) for a nail to grown back, depending on how far back the nail was lost. If your dog is licking at the area, then an e-collar may be needed to discourage the licking as it could further irritate the nail. A bandage (that is changed every few days) may also be needed for some time if the nail is painful or getting dirty from going outside or being licked. I would let your vet know that the area looks pink/raw still- they may wish to extend the antibiotics and see you to place a bandage on for a few more days.