Not morals, but instincts: dog trainers explained who dogs actually consider "bad."

      A dog's "sense for bad people" is a topic surrounded by myths. As explained by the Russian Cynological Federation, there is some truth to this belief, but with an important caveat: pets do not attribute moral meaning to human actions. They cannot recognize a deceiver, a trickster, or a poser—this is the realm of humans. So, on what basis does a dog conclude that it is facing a "bad" person?

      RKF President Vladimir Golubev highlights four main indicators. The first is body language. Sudden movements, loud footsteps, a piercing gaze, looming over the animal—all of this is perceived as a direct threat. In such situations, a dog either runs away or prepares to defend itself.

      The second factor is smell. A dog's sense of smell is so acute that they can even detect hormonal releases. An aggressive or drunk person smells different—animals pick up on this very well. The third point is the owner's reaction. If the owner tenses up or becomes anxious in the presence of someone, the dog immediately adopts their wariness. Conversely, if the owner is happy and affectionate, the pet relaxes.

      The fourth is past experience. This is often what confuses things. A dog that was once harmed by a man with a stick may panic at the sight of any similar person with a stick in the future—even if they are completely harmless. Correcting such false associations is difficult and time-consuming.

      Thus, a "bad" person in the eyes of a dog is not a villain, but a bearer of frightening signals: an unnatural posture, boundary violations, internal tension that smells of cortisol, or a coincidental resemblance to a traumatic memory. Yes, pets can notice that something is off with a stranger before their owner does. But their assessment is not always accurate—one cannot exclude the influence of past negative experiences.

      The RKF also reminded about the rules for meeting a dog: do not loom over them, squat down, avert your gaze, and allow them to sniff you. And do not raise your voice at the owner—otherwise, the pet will defend them. Often, people think that the dog has "identified a bad person," when in reality, it has simply assessed danger signals—sometimes incorrectly.