Why do dogs like to smell everywhere outside?

First: Because dogs can’t speak, they can only convey messages to each other through smell; language is very important to us humans, and smell is very important to us. It is also very important for dogs.
Second: Collect different information; dogs like to sniff everywhere, which means they are collecting different information; just like us humans, we must keep pace with the times and learn new things.
Third: When dogs go to a strange environment, in order to better understand the environment, they will choose to rub here and there, pee here and there; on the one hand, it is to let themselves Get familiar with the environment faster, and secondly, you can leave your own scent for other dogs to collect.