Key Differences Between Pet and Human Senses

Ever wondered why your dog insists on sniffing a lamppost for five minutes? Or why your cat loves meat but isn't interested in fruit?

Although animals and humans share the same five senses – sight, touch, hearing, smell, and taste – our pets perceive the world quite differently from us.

Eye spy

Cats and dogs are born with their eyes closed, which typically open within the first few weeks of life. Both animals are excellent at detecting movement, thanks in part to their predatory instincts. However, their vision differs from ours in several ways.

For example, cats and dogs generally see fewer colours than humans and have less detailed vision at a distance. Goldfish, on the other hand, can perceive a wider range of colours than humans, including ultraviolet light.

Animals with widely spaced eyes tend to have better peripheral vision than humans. Sighthounds, for example, have a particularly wide field of vision.

Animals that are prey in the wild, such as rabbits and guinea pigs, also have an exceptionally wide field of vision, with small blind spots directly in front of and behind them. This helps them keep an eye out for predators approaching from different directions, which is one reason sudden movements may startle them.

Cats, on the other hand, have forward-facing eyes that provide excellent depth perception, helping explain why they can pounce on their toys with such accuracy!

Although cats can't see in complete darkness, their eyes are particularly well adapted to low-light conditions. They have a reflective layer behind the retina called the tapetum lucidum, which helps them make the most of available light and gives their eyes that distinctive shine in the dark.

Touchy-feely

Fish have sensory receptors throughout their bodies, but they also have a specialised sensory system called the lateral line.

Running along the sides of their bodies, this system helps them detect movement, changes in water pressure, and vibrations in their surroundings.

Cats and dogs also have touch receptors throughout their bodies, so it's little wonder many enjoy being petted! Touch is one of the first senses to develop, helping young animals explore and interact with their environment.

Cats use their sensitive paw pads to investigate surfaces, while dogs often explore new objects with their mouths.

A cat's face is particularly sensitive, especially around its whiskers. These remarkable hairs, also called vibrissae, are deeply rooted in the skin and surrounded by sensitive nerve endings.

Whiskers help cats detect nearby objects, navigate tight spaces, and sense subtle changes in air currents.

Rabbits, guinea pigs, rats, mice, and chinchillas also have whiskers on their faces. Cats even have shorter whiskers on the backs of their front legs!

Hear, hear

Many animals have a major advantage over us when it comes to hearing: large, mobile ears.

Their ear shape and ability to move their ears independently can help them detect sounds and identify where noises are coming from.

Animals with floppy ears, such as lop-eared rabbits and certain spaniel, hound, and setter breeds, may hear differently from animals with erect ears. However, hearing ability also depends on factors such as breed, age, and individual health.

Some white cats with blue eyes are also more likely to be born deaf due to inherited genetic traits, although not all white, blue-eyed cats are affected.

In many cases, our pets can hear a wider range of frequencies than we can.

Humans can typically hear sounds up to around 20 kilohertz (kHz), while dogs can detect frequencies of approximately 45 kHz or higher, and cats can hear even higher-pitched sounds.

This helps explain why cats can detect the high-frequency noises made by small rodents, while dogs can hear certain training whistles that are inaudible to humans.

However, not all animals can hear higher frequencies than us. Budgies and goldfish, for example, have a more limited hearing range than cats and dogs.

Nose knows

Many pets, especially dogs, have a much more powerful sense of smell than humans.

Dogs have millions of scent receptors in their noses, allowing them to detect and distinguish between a remarkable range of odours.

They rely heavily on their sense of smell to explore their environment, recognise other animals, and gather information about the world around them.

This exceptional ability is why specially trained dogs are used by police, search-and-rescue teams, and airport staff to detect everything from explosives and illegal substances to missing people.

Despite their shorter snouts, cats also have a highly developed sense of smell and use scent marking as an important form of communication.

Cats may spray urine to mark their territory, particularly if they're undesexed or experiencing territorial stress.

They also have scent glands around their cheeks, forehead, and other parts of their bodies. When a cat rubs its head against an object or person, it's leaving behind its scent.

Dogs also use scent marking to communicate. Their anal glands produce distinctive odours that convey information to other dogs, helping explain why sniffing beneath each other's tails is such a common greeting behaviour.

Moisture on the surface of a dog's nose can help capture scent molecules, while the structure of their nasal passages allows them to process odours in remarkable detail.

But cats and dogs don't rely solely on their noses to detect scents.

They also have a specialised sensory organ called the vomeronasal organ, or Jacobson's organ, which helps detect certain chemical signals.

When cats encounter an interesting scent, they may curl their upper lip and hold their mouth slightly open. This distinctive expression is known as the flehmen response.

Sugar and spice

The vomeronasal organ plays a role in detecting chemical signals, particularly those involved in communication between animals.

However, most everyday tasting occurs through taste buds in the mouth, much like it does in humans.

As omnivores, dogs can detect a variety of flavours, including sweet, sour, salty, bitter, and savoury tastes.

Cats, on the other hand, are obligate carnivores, meaning they rely on nutrients found in animal-based foods. Their taste receptors are particularly suited to detecting flavours associated with meat, and they lack a functional receptor for detecting sweetness.

But how do our pets compare with humans when it comes to taste?

Humans have thousands of taste buds, while dogs have approximately 1,700 and cats have only around 470.

Rabbits have a particularly well-developed sense of taste, with more taste buds than either cats or dogs.

So, if cats have relatively few taste buds, why can they be so fussy about their food?

It turns out that factors such as smell, texture, temperature, and familiarity can all influence a cat's food preferences.

But that's another story!

The sixth sense

Animals are often credited with extraordinary abilities, such as predicting earthquakes, detecting illness, and finding their way home over long distances.

But are these abilities really due to a mysterious 'sixth sense', or are they simply examples of animals using sensory abilities that are more developed than our own?

In many cases, science suggests the latter.

For example, some animals may detect subtle vibrations associated with earthquakes before humans notice the shaking. However, there is currently no reliable scientific evidence that animals can consistently predict earthquakes before they occur.

Other animals use specialised sensory abilities that humans don't possess.

Bats and dolphins, for example, use echolocation to navigate and locate objects. This involves producing sounds and interpreting the echoes that bounce back from their surroundings.

Some sharks can detect electrical signals produced by other animals, while certain migratory birds and other species can sense Earth's magnetic field to help them navigate.

Dogs may also be capable of detecting chemical changes associated with certain medical conditions.

In fact, a 2006 study found that specially trained dogs could distinguish between breath samples from some cancer patients and healthy individuals. However, further research is needed before this type of scent detection can be considered a reliable diagnostic method.

As for animals' supposed psychic powers, the jury's still out on that one!

What we do know is that our pets experience the world in fascinating and sometimes surprising ways. Understanding their senses can help us better appreciate their behaviour and create environments that suit their unique needs.

Want to help your pet explore the world through their senses? Explore Petstock's range of pet supplies to find toys, enrichment activities, and everyday essentials to keep your pet happy, healthy, and stimulated.