Every dog owner must have seen their beloved pooch running down the hall just when they are about to open their favorite snack in the kitchen and wondered how they knew. Well, it’s simply because your dog has a strong sense of smell, one that’s magnitudes better than a human’s.
How much better can a dog smell than a human?
You will be surprised to learn that a dog’s smelling power is way higher than humans. Scientists say a dog’s sense of smell is 10,000 to 100,000 times more acute or better than a human’s.
Dogs’ noses are adapted to function and smell much better than their human counterparts. They have up to 300 million olfactory receptors in their noses as compared to 6 million for humans. Plus, the part of their brain that interprets the scent is about 40 times larger than in human beings. Moreover, your fur buddies have neophilia, which means they are attracted to new and interesting odors.
No wonder, many agencies worldwide enlist the help of dogs to sniff out drugs, bombs, pursue suspects, or find dead bodies. Nowadays, canines are also being used in the medical field. Besides detecting cancer, dogs can also predict seizures, and sense tuberculosis, diabetes, and malaria in humans just from smell. They can even smell when you are stressed, making them excellent emotional support animals.
The reason behind their smelling power is that dogs smell differently than humans due to a phenomenon called sniffing lateralization. Due to this phenomenon, dogs sniff with each nostril separately.
For instance, they start sniffing primarily with the right nostril, but for familiar or non-aversive scents such as food, they switch to the left nostril. And for threatening, arousing scents, or aversive smells, they use the right one.
However, the smelling power of dogs is not the same in all breeds. Hound breed dogs have the best sense of smell, while German Shepherds and Labradors follow closely behind. However, the sense of smell in canines declines with age.
How do dogs’ other senses compare to humans’?
Like humans, dogs also have the same five senses. However, some of them are more highly developed while others are not as good as compared to human beings.
To begin with, other than smelling power, dogs have exceptional hearing. The canines could hear noises at much higher frequencies than their human counterpart. While it may be difficult for a person to hear anything above 23,000 Hertz, dogs can hear sounds up to 45,000 Hertz.
However, dogs struggle to hear anything below 67 Hertz while humans can hear noises as low as 64 Hertz. When it comes to taste buds, they are poorly developed in dogs as compared to humans.
Contrary to the belief that dogs have poor perception of colors or can only see in shades of black and white or yellow and blue, some dog breeds have very keen eyesight. Dog breeds like the Saluki and the Afghan Hound can detect any movement far on the horizon. While pooches might not see well in bright light as humans, they can see better in poor light, which helps them to hunt prey.
Just like humans, dogs are also sensitive to touch. They rely on this fifth sense to communicate with other animals or with their human friends. So, touching a dog is essential to help them relax, stimulate, train, or bond with them.
