We have to be really responsible when it comes to our pet's health. They won't be able to tell us what exactly hurts them, so we have to be attentive to all the changes in their behavior. As I read in this article https://bulldogpapa.com/help-why-does-my-dog-keep-blowing-air-out-his-nose/. There are a lot reasons why the dog can even sneeze. So please be responsible pet owners ! Try to pay attention to all the changes in your dog's behavior. Make a vet appointment in case that you observe that something is wrong with it.