Dog Licking Human Wound. Not only does licking potentially introduce infection, but the act of licking can break down tissues and suture. Since one of the differences in the mouth is the presence of saliva, scientists have studied it to see if there is a correlation.

Well, for some people licking wounds might be a nasty thing to do. When a dog licks a wound, it removes any dirt and debris from it. There is a common folk belief that animal saliva.