The Dog

In this essay, the author

• Describes all eras and cultures since the days of the cave.
• Explains that remains of a dog, estimated to be 10,500 years old, have been found in idaho.
• Explains that the ecology of dogs helps humans in many fields of life.
• Explains that the skeleton of a dog functions as mineral and blood deposit of the body.
• Explains that extra bone has to be added for male dogs which is the penile bone.
• Explains that joints permit the movement of the bones. there are three types of joints.
• Explains that the ones in the skull don't permit any movement but keep the bones together.
• Explains that inside of this group of joints there are various types of bones.
• Explains that it permits the movement of the skeleton and it also moves the skin of a dog.
• Explains that the smooth muscle is the one present in the heart.
• Explains that the digestive system of a dog is very similar to one of humans.
• Explains that the stomach to the small intestine is only 3 meters long, but it has a very strong stomach.
• Explains that the rectum and anus are made through a series of added glands.
• Explains how the air is then canalized through the two bronchi and then inside the lung.
• Explains that the male gonads are the testicles inside a sac and the scrotum.
• Explains that the penis of a dog is surrounded by penile bone, like urine does.
• Explains that the eye of a dog consists of the cornea, iris, lens, and retina.
• Explains how oxygen diffuses into the blood and returns to the heart, the left atrium.
• Describes the valves that connect the vena cava to the right atrium.
• Explains that the dog's training is faster than that of a human.
• Explains that the dog needs to drink huge amounts of water for its body needs.
• Opines that the mandible isn't very effective in the dog since it's not moving.
• Explains the amount of bile from the liver secreted is of 25milliters per liter.
• Explains that these feces go through the rectum and then to the anus where they finally leave.
• Analyzes how the dog copulates too much in a row. the dog's testosterone, the sex hormone, is responsible for copulation.
• Describes how the dog's vagina swells and spills when the follicles grow in their ovaries.
• Explains that the dog's vagina isn't bleeding anymore after 8 days. the dog is very healthy.
• Explains that the posestruation occurs if the dog is not pregnant and it lasts 12 to 72 hours.
• Explains that the anestro lasts 3 months and a half and is secreted in the ovary.
• Explains that the penis of a dog gets erect by filling the tissue with blood.
• Explains that placenta is released and eaten by the mother. the period between puppy and mother is summary
• Explains that when temperatures are low, the dog uses two temperatures.
• Explains that dogs can lower the loss of heat by constricting the blood vessels of the dog.
• Explains that when heat is too much, the dog seeks cool.
• Compares the dog's smell to the human smell. an average dog has 147 smells.
• Explains that the ear functions as the ones of other mammals such as humans.
• Explains that locomotion in dogs is the same as in humans.
• Explains that dogs are polygamists, they don't have a definite couple, and they are not polygames.
• Explains that dogs can get depressed and they may tend to escape from their home.
• Explains that the dog can also identify a prey by its smell.
• Analyzes the constant movement of the tail of a dog to show happiness.
• Explains the importance of the dog as a work animal and psychological support for humans.
• Explains that the gonads of the female dog are composed of ovaries, which are under the kidneys, and produce eggs. ovaries are active after the dog is 4 to 6 months old.
• Explains how a zygote is formed and stays in the uterus for two weeks until it sticks to the wall.
• Explains that the peripheral n. s. is composed of the nerve cells and the autonomous one is made up of sympathetic and autonomous cells.
• Explains that the dog's ear is long and curved. it is composed of the same structures as that of a human: the tympanic membrane, the series of tiny bones
• Explains that the change of pressure in the lungs forces air in and the respiration rate is faster than the outside.
• Analyzes how the dog drinks by moving its tongue back and forth and in form of a spoon. it impulses the water into the mouth.
• Explains that the reproduction system of the female dog is much more complex than that of a male dog.
• Explains that trapping the penis in the vagina produces three ejaculations in a male dog. the middle one with more sperm than the other two.
• Explains that the dog arcs its body or goes near other dogs to prevent heat loss. if this isn't enough, it uses more energy.
• Explains that smell is the most developed sense in the dog. a dog can smell a drop of acetic acid which has been diluted in 1,000 liters of water.
• Explains that the functioning of the ear is the same as in a human. the vision capability of dogs is not comparable to that of humans.
• Explains that dogs have a special coating in the eye globe that permits the dog to see more light when it is visible.
• Explains that dogs do not have to live in groups to have these ranks, it is a natural instinct that even exist in dogs living with owners in cities.
• Explains that the female exposes its vulva to the male when they meet. the sexual act goes after a series of sexual acts.
• Narrates how a dog looks for safe, warm, and comfortable places to place her dogs to be born.
• Explains that dogs bark to warn others of danger. a howl in the middle of the night is a concentration call.
• Explains that cut bark expresses menace, happy bark, and special bark to indicate a prey.
• Explains that a fixed look means fear or malevolence. a dog's look to sheep or cows can control them and place them in order.
• Explains that a dog moves its body to make it look bigger, and exhibits submission by lying on the floor and with its tail between its legs, showing its genitals.