Have you ever wondered how your dog seems to know you are about to come home even before you open the gate? Or why he becomes agitated during a thunderstorm that is still barely audible to you? The answer lies in the extraordinary biology of his senses — a true natural superpower that continues to astonish science.
In this article, we travel through the five (or six) senses of the dog and reveal findings that will change the way you see your companion.
Smell: the king of the senses
If there is one sense in which the dog is absolutely superior to the human being, it is smell. While we have around 5 million olfactory receptors, the dog has between 220 and 300 million, depending on the breed. The Bloodhound, for example, has such a precise sense of smell that its tracking is admissible as evidence in court in some countries.
What this means in practice
- They can detect a teaspoon of sugar diluted in two Olympic-sized swimming pools.
- They identify human emotions through chemical changes in our sweat.
- They are used to detect cancer, hypoglycaemia and epileptic seizures before symptoms even appear.
What is more, dogs possess a vomeronasal organ (Jacobson’s organ) on the roof of the mouth, which allows them to “taste” scents and detect pheromones — something we humans lost over the course of evolution.
Vision: the myth of “black and white”
For decades, it was believed that dogs saw the world in black and white. This is not true. Dogs are dichromats, which means they do see colours — just in a different palette from ours.
What your dog actually sees
- They mainly distinguish shades of blue and yellow.
- Red and green appear as grey tones.
- They have far superior night vision to ours, thanks to the tapetum lucidum — the reflective layer that makes their eyes glow in photographs.
- They detect distant movement much better than we do, but have less sharpness for close-up detail.
So if you want to buy a toy that is genuinely visible to your dog, choose blue or yellow — and avoid the classic red found on so many toys.
Hearing: they hear what we cannot even imagine
Dogs hear frequencies between 40 Hz and 60,000 Hz, whereas humans are limited to around 20,000 Hz. That is why they react to “silent” whistles and to sounds that are completely imperceptible to us.
Fascinating facts about canine hearing
- They can move their ears independently, thanks to 18 separate muscles, to locate the source of a sound.
- They identify the sound of the owner’s car among dozens of others, even from streets away.
- They sense seismic vibrations minutes before an earthquake — one of the reasons they become restless before such events.
Touch: far more than a stroke
A dog’s skin has extremely sensitive nerve endings. But it is in the whiskers (vibrissae) that one of their finest senses lies. These specialised hairs detect air currents, vibrations and even changes in atmospheric pressure — which partly explains why so many dogs become unsettled before a thunderstorm.
Taste: the least developed sense
Here the dog falls behind. They have only around 1,700 taste buds, compared with our 9,000. They distinguish sweet, bitter, salty and sour — but their food preference is guided above all by smell. That is why warm food always seems more appetising to them: heat releases aromas.
The “sixth sense”: reality or myth?
Many owners swear that their dog knows when they are about to come home, when they are sad or when something is about to happen. Science confirms part of this phenomenon:
- They detect subtle hormonal changes in our bodies when we are ill or anxious.
- They memorise routines with extreme precision, to the point of anticipating behaviours.
- They respond to electromagnetic fields — recent studies suggest they orient themselves by the Earth’s magnetic field.
It isn’t magic. It’s remarkable biology.
Conclusion
Your dog doesn’t see the world the way you do — he sees it in a way that is far richer in scents, sounds and vibrations. Understanding this helps us offer them a more stimulating, safer and happier life.
At Clivet Gaia, we believe that getting to know your animal in depth is the first step to caring for them with excellence. Have questions about your dog’s behaviour, hearing or vision? Get in touch via WhatsApp and book a personalised assessment.
