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It usually will take a couple of days and then you will see some reddening of the skin and then you will see the problems start.
Dog's mouths can be pretty dirty and full of bacteria (contrary to what people believe) and this can easily cause a problem.
If you are seeing a problem, you can try washing the wound with betadine and then applying some neosporin ointment. If it is draining at all or it has a smell or redness and discharge, you will want to see your vet for possible antibiotics.
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