3 Fascinating Dog Facts - And the Science Behind Them

Dogs live alongside us every day, but the way they experience the world is very different from ours. Their noses, sense of smell, and even the way they cool themselves are all fascinating examples of how specially adapted they are.

Here are 3 Dog Facts:

A dog's nose pattern can be unique to that individual dog

If you look closely at a dog's nose, you'll notice a detailed pattern of tiny ridges and grooves across its surface.

Research has found that these nose patterns can be unique to individual dogs and can remain recognisable over time, meaning they can potentially be used as a biometric identifier - rather like the way fingerprints can identify people. One study examined nose images from dogs of different breeds and found the patterns could distinguish individual dogs.

This doesn't mean every dog's nose pattern is automatically stored on a national database. For a nose pattern to help identify a particular dog, an image or biometric record would first need to have been registered somewhere so that a later image could be compared with it.

The idea isn't completely new either. Research discussing canine nose identification notes that nose prints have historically been used as proof of identity in some settings. Today, digital image recognition makes it possible to explore nose-pattern identification without physically taking an ink print.
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And that remarkable nose has another much bigger job: helping dogs understand the world around them through scent.

Dogs can have up to around 300 million scent receptors

A dog's sense of smell is on a completely different level from ours.

Humans have roughly 5-6 million olfactory receptors, while dogs can have around 125-300 million, depending on factors such as breed. Their brains also devote far more processing power to interpreting smells than ours do.

That helps explain why dogs spend so much time sniffing when they're outside.

To us, a patch of grass might simply smell like grass. To a dog, it can contain layers of scent left by other dogs, animals and people. Sniffing gives dogs information about their surroundings that humans simply cannot detect with our noses.

Their extraordinary sense of smell is also why dogs can be trained for scent-based jobs. Depending on their training, dogs can help search for missing people and detect particular substance or odours.

So when a dog stops during a walk to investigate a lamppost or patch of ground, it isn't necessary wasting time. Smelling is one of the main ways dogs explore and gather information about their environment.
Find out more: https://gawa.org.uk/tips-advice/dogs-are-scent-sational/


Dogs cool themselves mainly by panting

Dogs regulate their temperature quite differently from humans.

When humans become hot, sweat evaporates from across much of our skin and helps cool us down. Dogs do have sweat glands, but the merocrine sweat glands involved in cooling are primarily located in their paw pads. Sweating through the paws only makes a relatively small contribution to keeping a dog cool.

Instead, dogs rely heavily on panting

When a dog pants, moisture evaporates from areas including the tongue, nasal passages and respiratory tract. That evaporation helps the body release heat. Dogs also use mechanisms such as widening blood vessels near the skin to help dissipate heat.

That's why you may notice a dog panting after exercise or during warm weather. It is an important part of their temperature-control system.

Dogs also have another type of gland called apocrine glands throughout their bodies, but these are associated more with scent and chemical communication than with cooling. So it wouldn't be accurate to say dogs have no sweat glands elsewhere - the key point is that the glands that function like human cooling sweat glands are mainly in the paws.

Panting can also happen for reasons other than being hot, including excitement, stress, pain or illness, so unusually heavy or unexplained panting shouldn't automatically be assumed to be normal cooling behaviour.
Find out more: https://www.pdsa.org.uk/what-we-do/blog/beat-the-heat-how-to-keep-your-dog-cool-in-summer

Dogs really are remarkable animals

From unique nose patterns to an extraordinary sense of smell and a very different way of regulating body temperature, dogs experience everyday life in ways that can be difficult for us to imagine.

The next time your dog stops to investigate an interesting smell or starts panting after a walk, there's far more biology behind that behaviour than might first appear.

Which of these three facts surprised you the most?