Dog saliva has enzymes that kill off bacteria, and when a dog licks himself, it helps to get rid of dead tissue and clean dirt from wounds.
He is a very sweet dog, but we cannot get him to stop licking us. Dogs also lick because they like the taste of an owner's salty skin and out of.
Dogs show affection by licking people and sometimes even other dogs. Licking is a natural action for dogs. They learned it from the grooming and affection given.