No matter the cause, changing your puppy's food has to be a gradual transition to avoid stomach side effects, allowing your new friend to lick his lips in joy. (dogcare.dailypuppy.com)
A new study indicates that dogs can interpret our body language, and lick their lips when they see an angry human face. (petguide.com)
Don't let your dog lick your lips or mouth. (cesarsway.com)