ELI5: Why do dogs lick people?

Dogs lick people because it is their favorite way to say hello, show love, and learn all about you.

Since dogs do not have hands or words like we do, they use their wet noses and tongues to talk to the world and explore it. Here are the biggest reasons your furry friend gives you so many slobbery kisses:

• Doggy hugs and kisses: When your dog licks your face or hands, they are showing affection. Mother dogs lick their puppies to keep them clean and make them feel safe, so when your dog licks you, they are treating you like their beloved family.
• You taste delicious: Human skin has tiny bits of salt from sweat, especially after you run around and play outside. If you just ate a yummy snack, like a peanut butter sandwich, your dog can smell it on your fingers and wants a tiny taste!
• A superpower for sniffing: A dog's tongue helps them gather information. Licking you is like reading a story about your whole day. They can figure out where you went, what you touched, and even if you are feeling happy or sad.
• Asking for attention: Dogs are very smart and quickly learn that a big, wet slurp makes you laugh, pet them, or talk to them in a happy voice. If they feel lonely or want to play, they might use a lick like a gentle tap on your shoulder to say, "Look at me!"
• Feeling calm and happy: Licking actually releases happy chemicals inside a dog's brain. Just like hugging a favorite teddy bear makes you feel safe when you are tired or nervous, licking helps a dog relax and feel peaceful.