I have to agree that a dog shouldn't lick a surgery wound too much. Minor licking at it, after it has already started healing for a few days would not be bad, but dogs that lick surgery wounds while they are still fresh should be discouraged.

Minor scrapes, cuts, and spots shouldn't be a problem at all with licking, although some dogs can lick and become so obsessed with a spot they can make a small injury WORSE by constant licking...