The reason why dogs always stick out their tongues and pant in summer
In fact, this is the heat emitted by the puppy. People sweat when they are extremely hot. Sweat is discharged from many small holes in our skin. These small holes are called sweat glands. The puppy’s sweat glands are on its tongue. When it’s hot, the puppy will stick out its tongue to speed up its breathing, allowing the sweat to be expelled more quickly, giving off heat, and feeling cool. Dogs are very heat-labile animals, because they don’t sweat, and they don’t stop moving due to heat; the dog’s body cannot adjust its temperature by itself, and the dog cannot take care of itself and replenish water in time; the sweat glands of the dog are all on the tongue Therefore, seeing the dog spit out tongue and panting means that the dog is very hot and needs to drink water to cool down or stop moving; short-nosed dogs are more afraid of heat than long-nosed dogs and are less likely to dissipate heat.
During the summer vacation, I obviously came to my grandma’s house in the countryside, and saw my grandma’s puppy kept open and out of tongue. He said in a hurry, “Grandma, is the puppy sick? Why is it always gasping with open mouth?” Grandma touched Mingming’s head and said, “Silly boy, when we are particularly hot, we sweat. It is discharged from the many small holes in our skin. These small holes are called sweat glands. The sweat glands on the puppy’s body are on its tongue. When the weather is particularly hot, the puppy will open its mouth to speed up breathing and make sweat It’s expelled sooner, and the heat is emitted, and you feel cooler.”
After listening to my grandma, he clearly said: “Great, the puppy is not sick, it is opening its mouth to sweat!” Why does the puppy put its ears on the ground while sleeping? Dongdong has a cute puppy, fluffy Yes, it looks good. Dongdong plays games with it every day and goes for walks outside. Dongdong does not leave even when the puppy is sleeping.
Dongdong found that the ears of the puppy are always on the ground when they are sleeping. Why? It turns out that this habit of the puppy has been passed down from generation to generation. The dog’s vigilance is particularly high, it is always defending against being eaten by other fierce animals. Since the sound spreads faster on the ground than in the air, and the dog has a pair of sensitive ears, when he sleeps, he puts his ears on the ground, he can hear the sound coming from far away, and he is immediately awakened. After awakening, it will immediately look up, to find out the direction of the sound! See if there is an animal that might harm it.
Life habits of dogs
Dog’s sense of smell
The olfactory sensitivity of dogs ranks first among all animals, and blind dogs can use their noses to live like normal dogs. The sensitive sense of smell of dogs is mainly manifested in two aspects: one is the sensitivity to smell; the other is the ability to distinguish smell. Sensitivity varies depending on the type of taste, which is about 1200 times that of human smell. The dog’s nose can distinguish about 2 million different odors, and it also has a high degree of analysis ability, able to smell the kind of odor it is looking for from many mixed odors. The ability of dogs to perceive smell can reach the molecular level. For example, when 1 cubic centimeter contains 9000 butyric acid molecules, dogs can smell it, and in general, there are about 268×10.e+16 molecules per cubic centimeter of air. Therefore, dogs can feel the concentration of butyric acid at 3.36×10.e-17. When someone dilutes sulfuric acid by one tenth of a million, dogs can still smell it, and the olfactory sensitivity to acidic substances is tens of thousands of times higher than that of humans.
According to the findings of the European Lung Disease Foundation, lung cancer is the second leading cause of death among Europeans. The study found that dogs with olfactory training can smell 71 out of 100 lung cancer patients’ breath samples, and the accuracy of 372/400 can be achieved for samples without lung cancer.
The hearing power can reach 120,000 Hz, which is 16 times that of humans. The longest listening distance is about 400 times that of a person. The ability of dogs to discern the direction of sound is twice that of humans, and can distinguish 32 directions. It can distinguish whether the metronome vibrates 96 or 100 times, 133 or 144 times per minute. Dogs can establish conditioned reflexes based on changes in pitch and syllables for human passwords and simple language.
The dog can hear forty thousand cycles. The sound collected through the big ears travels through the external auditory canal to vibrate the tympanic membrane, and even vibrates the small bones of the middle ear, to the lymph fluid in the inner ear, and then is transmitted to the brain by the auditory nerve. Dogs can distinguish very small or high-frequency sounds (ultrasound). The ability to judge sound sources is also very strong. When a dog hears a sound, due to the sympathetic effect of its ears and eyes, it can completely observe six directions and listen to all directions. At night, it maintains a high level of alertness even when sleeping, and can clearly distinguish sounds within 1 km. Special attention is that we don’t need to shout loudly to the dog. Excessive sound or audio is a kind of adversity stimulus for it, which will make it feel pain, panic or panic.
The eyesight of a dog is only about three-quarters of that of a human, and among all animal species, the eyesight of a dog is roughly classified as medium. The dog’s single eye can only see 25 degrees, so it cannot see the closest distance to the front. A dog’s eyeball lens is relatively large and deformed like a horse’s eyeball, so it can’t adjust the sense of distance. It is about 20 to 30 meters. Dogs have a special ability to detect moving objects; they can detect a picture that moves 70 lines per second, while the line movement of a general TV picture is about 60 picks per second. When the light is dim, the eyesight of dogs is better than that of humans. Dogs are natural carnivores and live by hunting, so they have considerable eyesight in dark places. Dogs’ eyes can see short-wavelength colors. In addition, dogs’ corneas are also larger, allowing more light to enter the eyes, making it easier to see things in dimly lit places. But in the darkness where there is no light, the dog can’t see it either.
The visual difference between humans and dogs lies in the response to light. The human eye responds to the three primary colors (red, green, and blue) that cause various colors. Dr. Dennis Brooks, associate professor of ophthalmology at the University of Florida School of Veterinary Medicine, said that the vision of dogs is different from that of humans; dogs cannot distinguish various colors like humans, but dogs can indeed see certain colors. Dogs can distinguish different shades of blue, indigo, and purple, but they have no special sensibility for the high chroma colors such as red and green in the spectrum. Dr. Brooks’s research shows that red is dark to dogs, and green is white to dogs, so a green lawn looks like a piece of white grass to dogs.
The canine teeth are all short crown-shaped, the upper first and second incisor crowns are three-peaked, the middle part is a canine peak, with small peaks on both sides, and the remaining incisors have two small canine peaks. The canine teeth are dry and curved conical with sharp tips. It is a powerful weapon for offense and self-defense. The front sun teeth are three-dimensional and the sun teeth are multi-peak.
⑴The tooth type of adult canine teeth (permanent teeth) is 42 incisors, canine teeth, premolars, and molars.
⑵The tooth type of the young canines is: 28 incisors, canines, and premolars, and one premolar and molar is missing.
Dog sweat glands
In canines such as dogs and wolves, the sweat glands in their bodies are not very developed. They cannot regulate their body temperature by sweating like humans. Once their bodies are warmed, it is difficult to lower their body temperature, so dogs are very afraid of heat.
Dogs also have two types of sweat glands: exocrine sweat glands and apocrine sweat glands. The exocrine sweat glands used to regulate body temperature are only distributed on the pads of the four paws, and there are very few. Only a little sweat from the paws cannot lower the body temperature. The apocrine sweat glands that cause their body odor are distributed throughout their bodies and have nothing to do with body temperature regulation.
As long as the dog feels a little hot, it will open its mouth, stick out its tongue, and gasp for breath. This can secrete a lot of saliva instead of sweat. Dogs evaporate saliva to dissipate heat and lower body temperature. They drool a lot and reduce body temperature by evaporating saliva to absorb heat. When the weather is hot, this method alone cannot cool down smoothly. Therefore, it is difficult for dogs to lower their body temperature. Especially small-headed dogs such as pugs, horn dogs, poodles and chihuahuas, because of their short breathing organs, they are not good at regulating their body temperature and are particularly afraid of heat, so you should pay more attention.
The digestive tract of dogs is shorter than that of herbivores. The content of hydrochloric acid in the stomach of dogs is the first among domestic animals. In addition, the thick intestinal wall and strong absorption capacity make it easy and suitable for digesting meat foods.