Licking releases pleasurable endorphins. Dogs lick people and other dogs as a way to bond and show comfort or affection.
Dogs have a strong sense of taste and smell. Licking surfaces and people gives them sensory information.
Exploration is normal canine behavior. Licking objects, people or surfaces can help satisfy their curiosity.
Licking releases endorphins which can have a calming effect for anxious or stressed dogs. It can become compulsive.
Dogs may excessively lick areas that itch or hurt due to conditions like allergies, joint pain or parasitic infections.
Dogs may lick a lot if they don't get enough stimulation and activity. It's a form of displacement behavior.
Female dogs often lick their puppies as part of maternal care. The habit continues into adulthood.