A dog's sense of smell is so strong it can tell whether people have had sex. A new book on canine behaviour says canines can tell whether we've had sex, exercised, smoked or eaten just by sniffing us. "We're not particularly interested in smells and think smelling people is rude,” he said.
Whether you call it humping, mounting or thrusting, the behavior is natural in male and female dogs. For some dogs, it is a response to arousal. For others, it can just be a way to exert dominance and show that they're the top dog in the house.