Drooling when kissing or cuddling your dog is likely a, sometimes unconscious, involuntary physical reaction to the intense emotions, physical sensation, or sensory input of that moment. Here are the main reasons for this reaction: Intense Emotional Regulation (Empathy): When you interact lovingly with your dog, your brain releases a flood of oxytocin (the bonding hormone) and dopamine (reward chemicals). This strong, positive emotional surge can, for some, trigger an automatic, parasympathetic nervous system response—such as increased salivation—similar to how some people tear up when extremely happy.