Dogs rely on multiple senses to discern how you’re feeling. A cheerful, high-pitched “Good boy!” with a relaxed posture sends a very different message than a stern shout with rigid body language. Remarkably, they can even sniff out emotions. In a 2018 study, dogs exposed to sweat from scared people exhibited more stress than dogs that smelled “happy” sweat. In essence, your anxiety smells unpleasant to your dog, whereas your relaxed happiness can put them at ease.