have sweat glands, called apocrine glands, that release pheromones conveying details like age, sex, mood, and health. These glands are concentrated in the armpits and genitals. Since dogs can’t reach armpits easily, they investigate the crotch instead.
Dogs cannot speak, so they rely on scent to “ask questions.” Sniffing is their way of learning about another being, whether human or dog. It is their equivalent of introductions, handshakes, and greetings.
