Dogs experience much of the world through smell. With millions more scent receptors than humans, they can detect traces left by other animals, food, people, weather, and even changes in human emotions.
When a dog stops to sniff grass, trees, or sidewalks, it may be gathering information about other dogs, possible prey, territory, food, or unfamiliar surroundings. Sniffing is also an important form of social communication.
Allowing dogs time to sniff can provide valuable mental stimulation and may help them feel calmer and more confident. Different dogs also have different sniffing styles, depending on their personality, curiosity, and surroundings.
Instead of constantly pulling your dog away, give them reasonable time to explore scents during walks. Taking different routes and letting them investigate safely can make walks more interesting and rewarding for both you and your pet.