The truth is revealed: 10 cold knowledge that dogs are little-known!
You may feel that you know your dog very well, but do you know that there are actually many little-known cold knowledge hidden in dogs. Let us unveil their mystery together! The nose of a dog is unique 
Dogs can smell human emotions You may have discovered that when you are happy or sad, your dog will react differently. This is because they can sense hormone changes in your body through their sense of smell, thereby judging your emotional state. Dogs can see colors, but not like us; many people think that dogs are color blind and can only see black, white and gray, but in fact it is not. There are two types of pigment cells in dogs' eyes that can distinguish blue and yellow, but cannot distinguish red and green. So, if you want to buy toys for your dog, it is best to choose blue or yellow. There are three types of eyelids in dogs. In addition to the upper and lower eyelids, dogs also have a third eyelid, also called eye mask or inner canthal membrane. This eyelid is located on the inside of the eyeball, protecting the eyeball from dust and foreign objects, and secretes lubricating fluid and resists bacteria. Dogs can dream, and snore and twitch; you may think your dog is cute when sleeping, but do you know, they are actually dreaming? Scientists have found that dogs enter the rapid eye movement phase (REM) during deep sleep, which is the stage of human dreaming. At this stage, dogs will simulate what they have experienced during the day, such as chasing, playing, eating, etc. So, when you see your dog snoring, twitching, or wagging its tail while sleeping, don't bother them, they may be having a wonderful dream. Dogs can smile and imitate human expressions. You may think your dog is smart, but do you know that they can actually smile? Scientists have discovered that when humans smile at them, they also expose their teeth and tongues, expressing their happiness and friendship. This phenomenon is called emotional resonance, meaning that they can feel human emotions and mimic human expressions. Dogs have their own ID card and can vote. You may think this is a joke, but did you know that some countries and regions really issue ID cards to dogs and let them participate in the voting? For example, Switzerland awards each dog a dog tag with their name, owner's information and a unique number. This dog tag can not only be used to identify and track them, but also to pay dog tax, a levy on dog owners to maintain public health and safety. In some places in the United States, such as San Diego, California, some organizations will hold dog elections to allow dogs to run for honorary positions, such as mayors or ambassadors. These elections are usually for raising funds and promoting some charitable or environmental protection purposes, and are also a way to enhance friendship and understanding between humans and animals. Dogs have their own language and can learn human language 
Dogs have their own personality and will be influenced by zodiac signs. You may think your dog is special, but do you know that they actually have their own personality? Scientists have found that every dog has its own personality traits, such as lively, gentle, curious, stubborn, etc. Moreover, these personality traits are also affected by the signs at which they were born. For example, dogs born in Aries are usually brave, impulsive and highly-leading; dogs born in Taurus are usually steady, loyal and enjoyable; dogs born in Gemini are usually smart, curious and sociable. Dogs have their own hobbies and can express their preferences. You may think your dog is very obedient, but do you know that they actually have their own hobbies? Scientists have found that every dog has something they like and don’t like to do, such as: some dogs like to play balls, some dogs like to play ropes, some dogs like to play frisbees, some dogs like to eat meat, some dogs like to eat bones, and some dogs like to eat fruit. How about it, does these dogs’ cold knowledge open your eyes? Have you gained a deeper understanding and love for your dog? In fact, dogs have many other wonders, waiting for you to discover and explore. Hope you can enjoy this world full of surprises and fun with your dog!
Just like human fingerprints, each dog's nose has its own characteristics that can be used to identify them. Some agencies even use dogs’ nose prints to register and track them.
Dogs can smell human emotions You may have discovered that when you are happy or sad, your dog will react differently. This is because they can sense hormone changes in your body through their sense of smell, thereby judging your emotional state. Dogs can see colors, but not like us; many people think that dogs are color blind and can only see black, white and gray, but in fact it is not. There are two types of pigment cells in dogs' eyes that can distinguish blue and yellow, but cannot distinguish red and green. So, if you want to buy toys for your dog, it is best to choose blue or yellow. There are three types of eyelids in dogs. In addition to the upper and lower eyelids, dogs also have a third eyelid, also called eye mask or inner canthal membrane. This eyelid is located on the inside of the eyeball, protecting the eyeball from dust and foreign objects, and secretes lubricating fluid and resists bacteria. Dogs can dream, and snore and twitch; you may think your dog is cute when sleeping, but do you know, they are actually dreaming? Scientists have found that dogs enter the rapid eye movement phase (REM) during deep sleep, which is the stage of human dreaming. At this stage, dogs will simulate what they have experienced during the day, such as chasing, playing, eating, etc. So, when you see your dog snoring, twitching, or wagging its tail while sleeping, don't bother them, they may be having a wonderful dream. Dogs can smile and imitate human expressions. You may think your dog is smart, but do you know that they can actually smile? Scientists have discovered that when humans smile at them, they also expose their teeth and tongues, expressing their happiness and friendship. This phenomenon is called emotional resonance, meaning that they can feel human emotions and mimic human expressions. Dogs have their own ID card and can vote. You may think this is a joke, but did you know that some countries and regions really issue ID cards to dogs and let them participate in the voting? For example, Switzerland awards each dog a dog tag with their name, owner's information and a unique number. This dog tag can not only be used to identify and track them, but also to pay dog tax, a levy on dog owners to maintain public health and safety. In some places in the United States, such as San Diego, California, some organizations will hold dog elections to allow dogs to run for honorary positions, such as mayors or ambassadors. These elections are usually for raising funds and promoting some charitable or environmental protection purposes, and are also a way to enhance friendship and understanding between humans and animals. Dogs have their own language and can learn human language You may think your dog can only bark, but do you know that they actually have their own language? Scientists have found that dogs convey different messages and emotions through different sounds, body movements and facial expressions. For example, when they are happy, they wag their tails, open their mouths and tongues; when they are afraid, they droop their ears, lower their heads and tails; when they want to play, they bend their front legs, raise their hind legs and tails. Moreover, dogs can also learn human language and understand some simple words and instructions. For example, some dogs can recognize hundreds of words and even learn some simple arithmetic.
Dogs have their own personality and will be influenced by zodiac signs. You may think your dog is special, but do you know that they actually have their own personality? Scientists have found that every dog has its own personality traits, such as lively, gentle, curious, stubborn, etc. Moreover, these personality traits are also affected by the signs at which they were born. For example, dogs born in Aries are usually brave, impulsive and highly-leading; dogs born in Taurus are usually steady, loyal and enjoyable; dogs born in Gemini are usually smart, curious and sociable. Dogs have their own hobbies and can express their preferences. You may think your dog is very obedient, but do you know that they actually have their own hobbies? Scientists have found that every dog has something they like and don’t like to do, such as: some dogs like to play balls, some dogs like to play ropes, some dogs like to play frisbees, some dogs like to eat meat, some dogs like to eat bones, and some dogs like to eat fruit. How about it, does these dogs’ cold knowledge open your eyes? Have you gained a deeper understanding and love for your dog? In fact, dogs have many other wonders, waiting for you to discover and explore. Hope you can enjoy this world full of surprises and fun with your dog!
