It's all about the dog. It's their time to be outside, sniffing around, enjoying the neighborhood and weather. It's their time for fun. It's their time to stretch their legs and exercise. It's their time to go potty and be happy dogs. Face it. They spend most of the day laying around , sleeping waiting for you to return. They need stimulus in their lives also. They need time to be outside walking around, exploring the area. Who knows, they might smell a different scent they have not smelled before.