An intriguing question to ask is how do dogs perceive the world? A well known fact is that dogs’ senses are generally much sharper than ours, but is their sense of smell really that much better than ours? Do they really hear better than we do? Would their eyesight be better than ours as well?
The World Through Smell
The sharpest sense in a dog is their sense of smell. Their sense of smell is much more developed compared to humans and serves as a major way they perceive the world. Their sense of smell allows them to map out and identify people, animals, food, territory and surprisingly even emotional states. But why exactly are their noses their primary method of perceiving the world?
Their noses are their most dominant sensor because:
- Their Noses are Well Developed
While humans might have around 5 to 6 million olfactory sensors, dogs have around 300 million. This means dogs have 30 times more olfactory sensors when compared with humans. Biologically and anatomically, the noses of these pups are well more developed than that of humans. Their olfactory system is better developed because:
- Larger number of sensors: The larger amount of sensors allows for your dog’s nose to capture more smell particles.
- Dedicated brain power: A significantly larger proportion of a dog's brain is devoted to processing smells compared to humans.
- Jacobson’s Organ: They have an additional specific sensory organ that helps detect pheromones and other chemical signals produced by animals.
Their noses being so developed is also why it is ill-advised to place strong smelling scents near dogs, as their noses are far more sensitive compared to ours.
- The Pathways From Scent to Memory
Dogs have an easier time associating smells with memory. They are able to remember experiences, places, emotions, people, objects and more based on smells alone. Their biology is wired differently than that of humans to be able to remember scents easier than humans:
- Direct neural wiring: In the canine’s brain, the olfactory bulb, responsible for receiving and analyzing smells, is directly connected to the hippocampus(memory formation) and amygdala (emotional processing). This means when a dog smells a scent, it instantly triggers memories and emotions.
- Chemical snapshots:Dogs rely more heavily on scent-based memories than humans do. They don't just recognize a person's face; they recognize an "olfactory fingerprint" made up of skin oils, hormones, and pheromones.
This is also linked to how your dogs are able to remember people when reunited, one whiff is enough to give your dogs memories of the individual based on their scent.
While their noses are incredibly well developed through evolution, can the same be said about their ears?
The World Through Sound
Dogs have an incredible set of ears. They are much more advanced than those of humans, designed for survival, and hunting. This is an evolutionary trait passed down to them by their predatory ancestors who relied on their ears to pinpoint the location of prey. Anatomically, the ears of your dogs are completely different to humans as:
- Directional hearing: Your pups have more muscles in the ears than humans. This allows them to direct their ears, through rotating, tilting, pointing. This lets them angle their ears to capture sounds more effectively.
- Superior hearing range: Hertz measures the frequency of a sound. Humans can typically hear around 20 to 20,000 Hz, though this depends from person to person. Dogs on the other hand can hear sounds as high as 47,000 to 65,000 Hz. This means their ears can hear higher pitched and more subtle sounds when compared to humans.
But their ears are not perfect. They aren’t the best at hearing in the animal kingdom, that title actually goes to cats.
But what about their sight? Are dogs able to see as well as we can?
How Dogs See the World
Our dogs seemingly have worse eyesight in certain areas. Normal humans usually have a 20/20 vision. However, most dogs have 20/75 vision. This means that our dog’s vision is blurry. In fact they would be considered very nearsighted, and would need glasses if they were human. Would this mean that our dog’s eyesight is worse than humans? Not necessarily, it means your canine’s eyes are adapted for different purposes compared to humans.
The eyesight of your dogs are different as:
- They See Colors Differently:
Dogs do not see the same colours as we do. It’s a common misconception that our canine friends are only capable of seeing the world in black and white. But this is not actually true. Your dogs can perceive two colours. This is what we call dichromatic vision. They can see:
- Blue
- Yellow
- Shades of grey
But they can not see reds, greens or oranges, which are all out of their spectrum. A fair few animals have dichromatic vision the same as dogs, which is why hunters usually wear orange vests, as bright orange appears much less vivid to many animals than it does to humans as we have trichromatic vision.
While they are unable to see certain colours, it by no means indicates that their eyes are worse than ours, just adapted for different purposes.
- They Have Better Night Vision:
One way our dogs’ eyes are adapted differently is that they are better at seeing things in the dark. It is why even though it is dark, your dogs can probably navigate the living room better than you can. Dogs have several anatomical advantages that allow them to see better in the dark than we can:
- They have more rod cells: Rod cells are specialised neurons that are capable of turning light into signals, that your brain can interpret as images.
- They have larger pupils: Larger pupils allow for more light to enter, stimulating your photoreceptors, allowing you to see.
- They have a tapetum lucidum: They have an additional organ that we humans do not have. The tapetum lucidum is a mirror-like layer of tissue located just behind the retina of the eyes of most animals. It helps reflect light back into the retinas which helps photon receptors have a second chance in absorbing light.
These anatomical advantages allow for our canines’ eyes to keep functioning in significantly lower light conditions than humans.
- They See Motion Better:
Our dogs are also well adapted to see motion. This evolutionary trait is vital, being animals that hunt. Your dogs are capable of detecting darting prey far more effectively than humans. This is because:
- More rod cells: Having more rod cells, which detect light and movement, allows for dogs to have eyes adapted for hunting. This comes with the trade-off of having less cone cells like humans do, which are responsible for processing color and sharp details.
- Higher flicker-fusion threshold: Dogs process moving images slightly faster than humans, helping them detect movement more effectively.
- Wider field of view: Depending on breed and head shape, many dogs have a wider field of view than humans.
It is not a simple question of if dog’s eyes are better or worse than humans, it is more a question of how they are specialized differently. Our pups are more adapted to detect and track movement, and see in low light. Humans on the other hand are adapted to see finer details and to distinguish colors.
While this answers our question as to how our pets perceive the world, through smell, hearing, and sight, what does this actually imply for pet owners?
The Key Takeaway
Having such sensitive senses is both a blessing and a curse. Your pets are a lot more sensible to everyday noises and scents. Loud sudden noises like fireworks can easily startle and stress out your dogs, and strong scents like perfume can irritate the noses of your pets. Understanding exactly how your pets navigate the world, means you can create an environment that accommodates them. Small adjustments in daily life can greatly improve how safe, relaxed, and connected your dog feels within the home.
Understanding how dogs experience the world allows us to communicate with them more effectively. The more we appreciate their unique sensory abilities, the better we can create environments that support their comfort, confidence, and wellbeing.
