Dogs nibble when "kissing" primarily as a sign of affection and bonding, stemming from puppyhood behaviors.
Here's a more detailed explanation:
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Affection and Bonding: As Dr. Mollie Newton, DVM explains, this behavior often originates from puppyhood, where gentle nibbling was part of playful interactions with littermates. When your dog nibbles on you, it's an expression of trust and that they see you as part of their pack.
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Expression of Trust: Nibbling indicates that a dog feels comfortable and secure around you. They are expressing that you are a trusted member of their social group.
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Remnant of Puppy Behavior: Nibbling is a behavior dogs learn early in life. It is related to how puppies interact with their mothers and littermates.
Essentially, your dog is showing you they love you and feel safe with you!
