Why dogs lick people
Dogs will also lick you to simply get your attention. It often starts as a sign of affection, but then it's reinforced by a person's reaction: laughing, smiling, or petting.
Dogs have licking coded in their DNA from canids, such as wolves. When the mother returned from hunting, the cubs licked her until they vomited and thus obtained food.
Another reason dogs lick you is to see how you taste. Once that dog gets to licking you, they might realize you have an intriguing salty flavour. Dogs love anything that has an interesting taste. Plus, licking is a way for your dog to explore their world.
Info source: https://www.thesprucepets.com/why-do-dogs-lick-people-1118300
Photo source: https://www.greatpetcare.com/dog-behavior/why-is-my-dog-constantly-licking/

I remember a dog vigorously licking body balm off my calves. It must have tasted great but can't have been that healthy.
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