First of all, dogs may feel uncomfortable around people who are afraid of them. This is because in this case the person begins to move quickly and sharply, watches the animal blankly, begins to speak in a high-pitched and anxious voice. Fear also causes the production of the hormone cortisol, which the dog detects with its sense of smell.
Dogs don’t like intrusiveness either. This scares them and makes them angry.
Another reason why dogs dislike some people is noise and harshness. They do not like people with loud voices, those who make harsh hand gestures, and those who speak rudely.
The smell of tobacco and alcohol is offensive to dogs. They are also wary of those that smell like other animals.
Dogs also avoid people who emit negative energy, are apathetic, and withdrawn. The same goes for those who are down.
Finally, it also happens that dogs dislike some people for no apparent reason.
Source: Ferra
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