We all know that red, green and blue are the three primary colors, and all colors can be mixed, but dogs only have two color receptors, blue and yellow, unlike humans who have three.

So when he ignores the orange toy on the green grass, it's because green and orange look the same in his eyes, so it's better to give him something blue to play with.

But when objects move, dogs can take advantage of their vision, processing visual information faster than we can.

You can think of their visual advantage as a slow-motion lens, which can automatically process the movement of objects into a slow-motion picture. This is why dogs always get there quickly in the Frisbee game.

This kind of skill feels very advanced just thinking about it!

Dogs’ hearing is also stronger than that of humans. Their hearing range is four times that of humans, and the audio height they can hear is twice that of humans.

So they can hear the buzz of a light bulb or even the pulse of a quartz crystal in a watch.

Does this sound more powerful than "Shunfeng Er"?

But the most powerful thing about dogs is of course their sense of smell. The dog's brain is only 1/10 of the human brain, but the area that controls the sense of smell is 40 times larger than that of humans. There are as many as 300 million olfactory glands in their nasal cavities, while humans There are only 5 million.

So don’t hide the bones so self-righteously, it doesn’t matter if it can’t be seen!

An important point to make here is that healthy dogs should keep their noses moist, which allows them to inhale as many odor molecules as possible.

Their noses have incredible superpowers. Detectives use their wisdom to solve crimes, and they are naturally able to use their noses to "restore the truth." That's why detectives always have a dog.

They can detect smells from long ago, and can even smell things that were there and then cleaned up, giving them insight into what happened days, weeks or even months ago. They are so efficient that one dog is a team, a search team of ten.

But this superpower comes from their "gluttonous" (foraging) instinct.

Before getting a dog, one question that is always asked is "Do dogs of this breed like to bark?" But did you know that barking is a way for dogs to communicate with us?

Barking is a common behavior among dogs. Some scientists believe that barking behavior occurs in order to comply with our needs, and it has been confirmed that dogs can convey at least six different emotions to us through barking.

​And after spending a long time together, we can often understand the meaning of their barking.

But even the simple act of drinking water is more complicated than it seems. Because they can make a mess even if they drink water, emmm, so what is this strange and complicated process?

That’s because when a dog drinks water, it will roll up its tongue and stick it into the water to form a flat surface to bring the water out, then put it into its mouth and quickly close it before a large amount of water spills out.

Dogs also dream. What do they dream about?

Dogs do dream. Scientists detected their brain waves and found that young dogs dream more than adult dogs.

Scientists also believe that dogs dream about things they experience every day as they process memories.

They probably also think, "After a busy day, what will happen in the future."

A little fun fact before you fall asleep: The contagious behavior of yawning is actually a sign of emotional connection. If your dog yawns with you, it means you have a connection.

What a wonderful emotional bond!

Do you know why you always feel comfortable when you are with a dog? Do you feel relaxed and happy when "petting the dog"?

Because our blood pressure decreases when we pet the dog, our bodies release oxytocin into the blood, the same hormone a mother releases when breastfeeding, because we feel the mother's feelings for her newborn baby. A calm and warm feeling.

Data also shows that dog owners live longer and are less likely to suffer from heart disease. Of course, "petting the dog" is also a mutually beneficial thing. Dogs' blood pressure also drops when they are petted, producing oxytocin. This kind of emotion is rounded up into the family affection between mother and child.

I have read this sentence before, "You are always frustrated to find that your dog chewed up your shoes again, but you never thought that maybe it was because you left the house every time you put on your shoes."

Don’t think this is a forced sensationalism, because dogs really understand you better than you think.

All this is because dogs are observing us all the time. Continuous observation seems to give them a sixth sense. They can read our body language in a way that other animals cannot.

Even because of this continuous observation and the "superpowers" they possess, they can sense the presence of cancer, whether diabetics are in a low blood sugar state, severe allergic reactions, epilepsy and even narcolepsy. It's just that they don't know how to express it to us, but after professional training, assistance dogs can become the best caregivers for sick owners.

The "continuous observation" of dogs on their owners is really touching. They pay attention to us and gain insight into unknown risks and even diseases. However, we often exaggerate our subjective feelings and think that taking care of dogs is a troublesome thing. We can always find excuses.