Dogs use their tongues to explore the world around them. Licking allows them to taste and smell different things, which helps them to learn about their environment.
Dogs also lick people and other animals as a way to show affection. Licking releases endorphins, which have a calming and soothing effect.
Dogs may lick excessively if they are experiencing pain or discomfort from a medical condition.
Dogs may lick the floor to clean up spills or crumbs.
Some dogs lick the floor in an attempt to get attention from their owners.
Dogs with certain medical conditions, such as nausea or allergies, may lick the floor excessively.
Some dogs simply enjoy the taste of wood.