Dogs perceive the world through their sense of smell by having an incredibly powerful olfactory system. They have up to 300 million scent receptors in their noses, compared to about 5 million in humans. This allows them to detect and differentiate between a wide range of scents, helping them navigate their environment, communicate with other animals, and even identify health issues or emotions in humans. Dogs use their sense of smell to gather information about their surroundings, track scents, locate food, and communicate with other animals. Their sense of smell is crucial for their survival and plays a significant role in how they experience the world around them.