All Question On One Page true false Humans usually concentrate on what they can smell, whereas dogs focus on what they can see. 2 Dogs use their sense of smell to understand the world around them. 1 Dog breeds which were traditionally hunters can easily recognise the smell of blood. 1 A dog breathes in through its mouth and out through its nose. 2 A dog also uses its tongue and mouth for smelling. 1 Pet dogs in Paris usually have the opportunity to be together with the dogs that they are attracted to. 2