There are many meanings for a dog to lick its owner's face, such as acknowledgment of a mistake, obedience, hunger, flattery, etc. This behavior of a dog is an innate habit, so it is best for the owner to observe carefully to see what the dog wants to express. Many owners may not like dogs licking their faces. It is best to start training from an early age and use other ways to express love for the dog. If the dog cannot feel the love of the owner, it may be sad.