A dog brain and a human brain differ in a way where the human brain has a bigger visual cortex compared to a dog’s brain. The dog brain has a larger olfactory cortex compared to humans. The olfactory cortex functions and processes the sense of smell, which explains the heightened sense.
While humans observe the world through their eyes, dogs experience and perceive the world through their sense of smell. Dogs also have another olfactory system that is located at the roof of its mouth. This is called the vomeronasal or Jacobson’s organ. This organ helps dogs sense things that cannot be seen, such as emotions, or whether another animal or stranger can potentially be either friendly or dangerous. This also helps dogs identify potential partners or mates as well.