If you’ve ever felt like your dog knew you were upset before you said a word, you’re not imagining it. Dogs experience the world differently than we do, picking up on facial expressions, body language, smells, sounds, and subtle changes that humans can easily overlook.
A recent study published in iScience adds another fascinating piece to what we know about dogs. Using brain scans, researchers found that dogs process human facial expressions differently depending on whether they’re seeing happiness, anger, fear, or sadness.
In other words, your dog may be paying much closer attention to you than you realize.
When You’re Happy
Your smile means more to your dog than you might think. Happy human faces can trigger activity in parts of a dog’s brain associated with reward and higher-level processing, which may help explain why dogs often seem to feed off our excitement and good moods.
When You’re Sad
Dogs can notice the difference between a happy face and one showing sadness. That change in expression can be enough to give them information that something about your emotional state is different, even before you’ve said anything.
When You’re Angry
A tense face, furrowed brow, stiff posture, or sudden change in behavior can quickly get a dog’s attention. Dogs are remarkably observant of the people around them, which means an emotional shift that feels subtle to you may not be subtle to them at all.
When You’re Afraid
Fear can change your expression, movements, posture, and behavior. Your dog may notice those changes almost immediately and become more watchful, hesitant, or alert.
When You’re Stressed
Stress doesn’t always have to involve crying or obvious frustration. Small changes in the way you move, speak, breathe, or interact with your surroundings can give your dog clues that you’re not behaving quite like yourself.
When Something About a Person Is Different
Dogs sometimes react strongly to one person while barely noticing another, but that doesn’t necessarily mean they have a mysterious ability to identify “bad people.” They may simply notice unusual body language, movement, expressions, clothing, smells, or behavior that stands out.
Changes in Your Body
A dog’s extraordinary sense of smell lets them notice changes humans would never detect on their own. Changes in body chemistry can create different odors, which is one reason specially trained dogs can be taught to recognize certain physical changes and medical events.
Related: 12 Dog Breeds With Expensive Grooming, Food, and Medical Needs
When a Seizure May Be Happening
Some dogs can recognize changes associated with seizures, and specially trained seizure-response dogs can assist people during or around these events. Not every dog will naturally provide an advance warning, however, so an unusual reaction from a pet shouldn’t be treated as a medical diagnosis.
Changes in Blood Sugar
Specially trained dogs can learn to alert people to changes associated with blood sugar levels. Their powerful noses allow them to recognize subtle scent changes that would be completely undetectable to the average person.
When the Weather Is Changing
Dogs don’t need a weather app to notice that a storm may be approaching. Changes in atmospheric conditions, along with distant thunder, wind, smells, and other environmental cues, may become noticeable to them before we pay much attention.
