1 thought on “What kind of dogs are dogs belonging to”
Margie
Dogs are dog mammals. The introduction of dogs: Dogs (Latin Canis Lupus) belongs to spinal animal doors, vertebrates, mammals, real beast subclase, carnivores, cracked asia, dogs. Chinese is also known as “dogs”. Dogs are carnivorous and are distributed around the world. Dogs and horses, cattle, sheep, pigs, and chickens are called “six beasts”. Coster believes that dogs are domesticated from early humans from the Gray Wolf. The domestication time is 40,000 years ago to 15,000 years ago. Known as “the most loyal friend of human beings”, it is now the most breeding pet. Its life span is more than ten years. In Chinese culture, dogs are one of the zodiac signs and 11th among the zodiac signs. The knowledge of dogs:
The ancestors of dogs: No one knows when the first interaction between people and the wolf occurs. Some scientists believe that it may be 50,000 years ago, because it takes at least so long for the wild wolf to develop today’s genetic differences. At that time, people and wild wolves were distributed in many places on the surface of the earth, and the evolutionary process may occur in several different areas. Some scholars believe that the wolf may even be domesticated by humans from wild wolves to domestic animals, or dogs, which may even be used to play, hunt, and watch home nursing homes in the southeast of Asia 16,000 years ago.
The dog originated in the wolf and has received consensus, but there are divergent opinions around the specific birthplace and time. The earliest evidence of dog fossils came from a mandibular lithoscopy from Germany 14,000 years ago. These archeological evidence supported that dogs originated in Southwest Asia or Europe. On the other hand, the characteristics of dog skeletal appraisal indicate that dogs may originate from wolves. This proposes the origin of the East Asian origin of the dog. In addition, different varieties of dogs are very diverse in form, and they seem to be inclined to the hypothesis of wolfs that originate from different geographical groups. It is difficult to provide reliable clues about the origin of dogs by archeology alone. The life of dogs: (1) The age of the dog is mainly judged by the following points: ① the growth of teeth (see “dog-physiological-teeth”); ② teeth Peak and tooth wear degree; ③ appearance and color. (2) The life expectancy of the dog is between 10 and 15 years under normal circumstances, the average life expectancy is about 12.6 years, and the longest is about 20 years. The characteristics of the dog: (1) The smell of the dog:
The dog’s smell sensitivity is the first of each animal. The blind dog can use the nose to live like a normal dog. dog. The sensitive smell of dogs is mainly manifested in two aspects: one is the degree of sensitivity to the smell; the other is the ability to distinguish the smell. The sensitivity will be different due to the type of taste, which is about 1200 times the sense of smell of human beings. The dog’s nose can distinguish about 2 million different odors, and it also has a high degree of analysis. It can smell the smell it is looking for from many mixed odors. Dogs’ perception of odor can reach molecular levels. When 1 cubic centimeter contains 9,000 butt acid molecules, the dog can smell, and in general, there are about 268 × 10.E 16 molecules per cubic centimeter of air. Therefore, the concentration of the dog feeling the buty acid is 3.36 × 10.E-17. When someone diluted the sulfuric acid by 10 million, the dog could still smell it, and the sense of sensitivity to the acidic substance was tens of thousands of times higher. The survey results of the European Lung Disease Foundation show that lung cancer is the second roughly dead cancer of Europeans. Studies have found that dogs who have been trained by smell can be heard from 100 patients with lung cancer patients, and the accuracy of 372/400 can also be reached 372/400 for samples without lung cancer. (2) Dog’s hearing: The auditory stress can reach 120,000 Hz, which is 16 times that of human beings. The longest distance of listening is about 400 times that of people. Dogs’ discerning ability of the sound direction is also twice the humans, and can distinguish 32 directions. It can distinguish the number of vibrations per minute of the auctioner of 96 or 100 times, 133 or 144 times. Dogs’ passwords and simple languages can establish conditional reflection according to the changes in tune syllables. The dogs can hear 40,000 weeks. The sound collected through the large ear can vibrate the tympanic membrane through the outer ear canal, and even the small bones of the ear in the middle ear to the lymph fluid of the inner ear, and then transmitted from the hearing nerve to the brain. Dogs can distinguish extremely small or high -frequency sounds (ultrasonic). The ability to judge the sound source is also very strong. When the dog hears the sound, because the relationship between the ears and the eyes can completely observe the six roads and listen to the ears. In the evening, even if it sleeps, it maintains a high degree of alertness, and it can be distinguished clearly about the sound within 1 kilometer. It is important to note that we don’t need to shout loudly to the dog. Excessive sound or audio is a adversity stimulus, which will make it feel painful, frightened or panic. (3) Dog’s vision: The vision of dogs is about three -quarters. Among all animals, the dog’s vision is listed in medium. The dog’s single eye can only see 25 degrees, so you can’t see the nearest distance on the front. The dog’s eyeball crystals are relatively large, and it is deforming like a horse’s eyeballs, so it cannot adjust the distance. Two or thirty meters is about its boundaries. Dogs have special detection capabilities for moving objects; they can detect the screens of 70 lines per second, while the general TV screen line movement is about 60 per second. When the light is dim, the dog’s vision is better than the human vision. The dog is a natural carnivorous animal that is born by hunting, so they also have considerable vision in the dark. The dog’s eyes can see the color of the short wavelength. In addition, the dog’s cornea is also large, allowing more light to enter the eyes, so it is easier to see things in the dim light. But in the darkness without light, the dog cannot see it.
The difference between people and dog vision is in the reaction of light. The human eye responds to the three primary colors (red, green, and blue) that causes various colors. The Associate Professor of Ophthalmology at the University of Florida at the University of Florida said that the vision of the dog is different from the human vision; the dog cannot distinguish various colors like humans, but the dog can indeed see some colors. Dogs can distinguish between blue, 靛, and purple of different depths, but there is no special feeling for high -chromaton colors such as red and green in the spectrum. Dr. Brooks’s research shows that red is dark for dogs, while green is white for dogs, so the green lawn is a white grass in the dog. (4) Dog’s teeth: The canine teeth are all short -crowned, upper jaw first and secondary tooth crowns are three peaks, the middle of the dog is peak, small peaks on both sides, and the remaining tooths have each dog. Small two peaks, conical shapes of drought and bending canine teeth, and sharp -edge sharp weapons of offensive and self -defense.
① A total of 42 pieces of canine teeth (constant tooth) teeth are: 42 pieces of incidents, canine teeth, front molars, and molars. ② puppies’ tooth types are: 28 pieces of the door, canine tooth, and front molars, and lack of 1 front molars and molars. (5) Dog’s sweat glands: The dogs such as dogs and wolves, the sweat glands in the body are not very developed. Like people, they can adjust their body temperature by sweating. Once their bodies are hot, it is difficult to reduce body temperature, so the dogs are very afraid of heat.
The dogs also have two types of sweat glands and top sweat glands. The outer sweat glands used to regulate the body temperature are only distributed on the meat pads of the four claws, and there are very few. It can not reduce the body temperature by relying on a little sweat on the paw. The top sweat glands that cause their body odor are distributed in their whole body and have nothing to do with body temperature regulation. As long as the dog feels a little hot, he will open his mouth, stretch out his tongue, and pant with a large mouth, so that you can secrete a large amount of saliva instead of sweat. The dog evaporates the heat by evaporating the saliva to reduce the body temperature. They drool in large quantities and reduce body temperature by evaporated heat. When the weather is hot, it is impossible to cool down alone. Therefore, it is difficult for dogs to reduce their body temperature. In particular, dogs, horn dogs, lion dogs, and Chihuahua dogs are very small. Because the respirators are short, they are not good at regulating body temperature. They are particularly afraid of heat. They should pay more attention. (6) Dog’s gastrointestinal: The dog’s digestive tract is shorter than the grassy animals, and the content of dog gastric acid hydrochloride is the first place in the livestock. Meat food.
Dogs are dog mammals.
The introduction of dogs:
Dogs (Latin Canis Lupus) belongs to spinal animal doors, vertebrates, mammals, real beast subclase, carnivores, cracked asia, dogs. Chinese is also known as “dogs”. Dogs are carnivorous and are distributed around the world. Dogs and horses, cattle, sheep, pigs, and chickens are called “six beasts”.
Coster believes that dogs are domesticated from early humans from the Gray Wolf. The domestication time is 40,000 years ago to 15,000 years ago. Known as “the most loyal friend of human beings”, it is now the most breeding pet. Its life span is more than ten years.
In Chinese culture, dogs are one of the zodiac signs and 11th among the zodiac signs.
The knowledge of dogs:
The ancestors of dogs:
No one knows when the first interaction between people and the wolf occurs. Some scientists believe that it may be 50,000 years ago, because it takes at least so long for the wild wolf to develop today’s genetic differences. At that time, people and wild wolves were distributed in many places on the surface of the earth, and the evolutionary process may occur in several different areas. Some scholars believe that the wolf may even be domesticated by humans from wild wolves to domestic animals, or dogs, which may even be used to play, hunt, and watch home nursing homes in the southeast of Asia 16,000 years ago.
The dog originated in the wolf and has received consensus, but there are divergent opinions around the specific birthplace and time. The earliest evidence of dog fossils came from a mandibular lithoscopy from Germany 14,000 years ago. These archeological evidence supported that dogs originated in Southwest Asia or Europe. On the other hand, the characteristics of dog skeletal appraisal indicate that dogs may originate from wolves. This proposes the origin of the East Asian origin of the dog. In addition, different varieties of dogs are very diverse in form, and they seem to be inclined to the hypothesis of wolfs that originate from different geographical groups. It is difficult to provide reliable clues about the origin of dogs by archeology alone.
The life of dogs:
(1) The age of the dog is mainly judged by the following points:
① the growth of teeth (see “dog-physiological-teeth”);
② teeth Peak and tooth wear degree;
③ appearance and color.
(2) The life expectancy of the dog is between 10 and 15 years under normal circumstances, the average life expectancy is about 12.6 years, and the longest is about 20 years.
The characteristics of the dog:
(1) The smell of the dog:
The dog’s smell sensitivity is the first of each animal. The blind dog can use the nose to live like a normal dog. dog. The sensitive smell of dogs is mainly manifested in two aspects: one is the degree of sensitivity to the smell; the other is the ability to distinguish the smell. The sensitivity will be different due to the type of taste, which is about 1200 times the sense of smell of human beings. The dog’s nose can distinguish about 2 million different odors, and it also has a high degree of analysis. It can smell the smell it is looking for from many mixed odors. Dogs’ perception of odor can reach molecular levels. When 1 cubic centimeter contains 9,000 butt acid molecules, the dog can smell, and in general, there are about 268 × 10.E 16 molecules per cubic centimeter of air. Therefore, the concentration of the dog feeling the buty acid is 3.36 × 10.E-17. When someone diluted the sulfuric acid by 10 million, the dog could still smell it, and the sense of sensitivity to the acidic substance was tens of thousands of times higher.
The survey results of the European Lung Disease Foundation show that lung cancer is the second roughly dead cancer of Europeans. Studies have found that dogs who have been trained by smell can be heard from 100 patients with lung cancer patients, and the accuracy of 372/400 can also be reached 372/400 for samples without lung cancer.
(2) Dog’s hearing:
The auditory stress can reach 120,000 Hz, which is 16 times that of human beings. The longest distance of listening is about 400 times that of people. Dogs’ discerning ability of the sound direction is also twice the humans, and can distinguish 32 directions. It can distinguish the number of vibrations per minute of the auctioner of 96 or 100 times, 133 or 144 times. Dogs’ passwords and simple languages can establish conditional reflection according to the changes in tune syllables.
The dogs can hear 40,000 weeks. The sound collected through the large ear can vibrate the tympanic membrane through the outer ear canal, and even the small bones of the ear in the middle ear to the lymph fluid of the inner ear, and then transmitted from the hearing nerve to the brain. Dogs can distinguish extremely small or high -frequency sounds (ultrasonic). The ability to judge the sound source is also very strong. When the dog hears the sound, because the relationship between the ears and the eyes can completely observe the six roads and listen to the ears. In the evening, even if it sleeps, it maintains a high degree of alertness, and it can be distinguished clearly about the sound within 1 kilometer. It is important to note that we don’t need to shout loudly to the dog. Excessive sound or audio is a adversity stimulus, which will make it feel painful, frightened or panic.
(3) Dog’s vision:
The vision of dogs is about three -quarters. Among all animals, the dog’s vision is listed in medium. The dog’s single eye can only see 25 degrees, so you can’t see the nearest distance on the front. The dog’s eyeball crystals are relatively large, and it is deforming like a horse’s eyeballs, so it cannot adjust the distance. Two or thirty meters is about its boundaries. Dogs have special detection capabilities for moving objects; they can detect the screens of 70 lines per second, while the general TV screen line movement is about 60 per second. When the light is dim, the dog’s vision is better than the human vision. The dog is a natural carnivorous animal that is born by hunting, so they also have considerable vision in the dark. The dog’s eyes can see the color of the short wavelength. In addition, the dog’s cornea is also large, allowing more light to enter the eyes, so it is easier to see things in the dim light. But in the darkness without light, the dog cannot see it.
The difference between people and dog vision is in the reaction of light. The human eye responds to the three primary colors (red, green, and blue) that causes various colors. The Associate Professor of Ophthalmology at the University of Florida at the University of Florida said that the vision of the dog is different from the human vision; the dog cannot distinguish various colors like humans, but the dog can indeed see some colors. Dogs can distinguish between blue, 靛, and purple of different depths, but there is no special feeling for high -chromaton colors such as red and green in the spectrum. Dr. Brooks’s research shows that red is dark for dogs, while green is white for dogs, so the green lawn is a white grass in the dog.
(4) Dog’s teeth:
The canine teeth are all short -crowned, upper jaw first and secondary tooth crowns are three peaks, the middle of the dog is peak, small peaks on both sides, and the remaining tooths have each dog. Small two peaks, conical shapes of drought and bending canine teeth, and sharp -edge sharp weapons of offensive and self -defense.
① A total of 42 pieces of canine teeth (constant tooth) teeth are: 42 pieces of incidents, canine teeth, front molars, and molars.
② puppies’ tooth types are: 28 pieces of the door, canine tooth, and front molars, and lack of 1 front molars and molars.
(5) Dog’s sweat glands:
The dogs such as dogs and wolves, the sweat glands in the body are not very developed. Like people, they can adjust their body temperature by sweating. Once their bodies are hot, it is difficult to reduce body temperature, so the dogs are very afraid of heat.
The dogs also have two types of sweat glands and top sweat glands. The outer sweat glands used to regulate the body temperature are only distributed on the meat pads of the four claws, and there are very few. It can not reduce the body temperature by relying on a little sweat on the paw. The top sweat glands that cause their body odor are distributed in their whole body and have nothing to do with body temperature regulation.
As long as the dog feels a little hot, he will open his mouth, stretch out his tongue, and pant with a large mouth, so that you can secrete a large amount of saliva instead of sweat. The dog evaporates the heat by evaporating the saliva to reduce the body temperature. They drool in large quantities and reduce body temperature by evaporated heat. When the weather is hot, it is impossible to cool down alone. Therefore, it is difficult for dogs to reduce their body temperature. In particular, dogs, horn dogs, lion dogs, and Chihuahua dogs are very small. Because the respirators are short, they are not good at regulating body temperature. They are particularly afraid of heat. They should pay more attention.
(6) Dog’s gastrointestinal:
The dog’s digestive tract is shorter than the grassy animals, and the content of dog gastric acid hydrochloride is the first place in the livestock. Meat food.