Licking

This is a harmless behavior that requires attention in the long run. 

Usually, dogs licking is a way of expressing affection to their owners, as this behavior promotes connection within the pack. Also, mother dogs lick their puppies to groom them and communicate care, and they pass on this habit. 

However, in some cases, dogs may lick as a coping mechanism when they are stressed or anxious. Also, dogs licking themselves continuously may indicate skin problems and should be investigated properly.