As close companions of human beings, dogs accompany our daily lives, providing meticulous companionship and loyalty.

But how much do we really know about these four-legged friends?

Below, I will share with you twenty little-known cold knowledge about dogs, let us enter the world of dogs together and unveil their mysterious veil.

1. You may not have thought that although dogs have strong limbs, most of them actually have acrophobia. Some puppies even show fearful eyes when going down the stairs, so when you find them hesitant, you might as well carry them downstairs gently and give them some extra care.

2. The key reason why dogs can establish deep emotional connections with humans is their excellent empathy. Some studies have pointed out that dogs’ emotional understanding ability is even more than 90% of men, and their sensitivity and delicateness are amazing.

3. When your dog yawns, it is actually imitating you. If it observes you yawn, it may yawn five times more times in a day. Next, let's explore more secrets in the dog world.

4. When we first meet, the dog will not smile. But if it often sees you smiling, it will learn how to show a smile. Behind its smile is eternal joy and companionship for you.

5. Dogs do not have eyebrows, but in their upper eyelids, there are eyebrow muscles that can move with mood changes. As their expressions change, the subtle tremor of these muscles seems to be conveying emotions to us with our eyebrows.

6. Regarding the visual colors of dogs, they are actually color blind. Dogs are good at identifying blue and gray, but they are difficult to distinguish colors such as red, orange, yellow and green.

7. The number of teeth in dogs is surprising. Humans have 32 teeth as adults, while puppies have 28 after they grow their baby teeth, and adults have an incredible 42.

8. Although dogs have an excellent sense of smell, their vision is not ideal and belongs to myopia. Humans can clearly see objects about 23 meters away, but the dog's vision range is limited to within 6 meters. Standing 7 meters away, they may not even recognize you.

9. The secret to making dogs feel so keen is that they have up to 300 million odor receptors in their noses, which allows them to capture subtle odors and thus exert their amazing olfactory ability.

10. Dogs can also feel lonely and sad due to prolonged neglect, and this accumulation of emotions can ultimately lead to depression.

11. You may not know that the number of toes in a dog is not consistent. Their front feet have 5 toes each, but their back feet have only 4. If you look closely, you will find that the fifth toe is degenerated, located above the hind leg.

12. Dogs that have been with their owners for a long time may gradually look more and more like their owners, which is a magical and interesting phenomenon.

13. Bitches actually go through the menstrual cycle, which is a sign of their estrus. If they are mated at this time, the possibility of pregnancy is extremely high. To avoid accidental pregnancy, consider spaying dogs before they get into estrus. Dogs after surgery are often prone to gain weight, so their owners should control their diet and take them out for exercise more often.

14. Dogs are usually full of energy, but they are likely to be sleeping when we cannot see them. Adult dogs need 10 to 15 hours of sleep a day, while puppies may sleep up to 20 hours a day.

15. Dogs will naturally shed too much hair, so artificial hair cuts are generally not required.

16. The nose pattern of each dog is unique, which is like their "identity card", and each pattern is unique.

17. Dogs do not have sweat glands, they dissipate heat by sticking out their tongues and using the help of their noses and soles of their feet.

18. Although large dogs look strong and mighty, unfortunately, they usually live longer than smaller dogs.

19. Dogs fart like humans, and sometimes smell very bad.

20. Dogs' teeth are mainly used to cut food, and they do not chew slowly like humans. Therefore, dogs should not be fed sharp bones to avoid scratching their throats. When grinding teeth, you can provide your dog with special pet snacks, which is safer.

We keep discovering new surprises as we explore the world of dogs.

You may also learn other interesting dog cold knowledge, so you might as well share it with us to gain a deeper understanding of these loyal partners.