Dogs experience the world primarily through scent, not sight or language. As the article explains, “dogs rely on smell as their foundational sense of perception.” A single sniff can reveal identity, emotional state, health, and stress levels. When a dog sniffs a person’s crotch, it may feel awkward to humans, but for dogs it is a normal and socially appropriate greeting.

This behavior is linked to apocrine glands in areas like the groin and armpits, which release pheromones. These scents provide dogs with detailed biological information. To them, a sniff is not rude or sexual—it is a way of asking, “Who are you, and how are you doing right now?” The dog’s nose functions as a communication tool that predates human language.

Humans, however, interpret privacy differently. While people may feel embarrassed, dogs have no intention to invade boundaries. Their actions come from instinctive social patterns that help them assess safety, recognize individuals, and build trust. As the article notes, “The dog’s initial curiosity is a form of affection.”

Owners who want to discourage this behavior can gently redirect their dog using simple commands and positive reinforcement. Dogs learn human boundaries quickly when guided calmly and consistently.

This powerful sense of smell also explains why dogs detect stress, illness, or emotional changes. “The same organ that draws a dog to investigate our private areas is the one that presses gently against our laps when we cry.” What feels awkward to humans is, for dogs, an expression of connection, awareness, and care.