Dog or domestic dog (Scientific name: Canis lupus familiaris or Canis familiaris;from Sino-Vietnamese called “cow” (狗) or “dog” (犬), or civet, the puppies are also called “dog”), is an animal of the genus Canis, forming part of the evolution of the wolf,[4] and the most numerous terrestrial carnivore.Dogs and gray wolves belong to a sister group, which, like modern wolves, are not closely related to the first domesticated wolves, synonymous with The original ancestors of dogs have become extinct.

Dogs were also the first animals to be domesticated by humansand have been bred over millennia for a wide range of behaviors, senses, and physical characteristics.This animal is used for house keeping or as a hobby. Their teeth are used to kill prey, chew meat and gnaw meat, sometimes to bite each other. Dogs are widely raised animals in the world, can look after the house, herd sheep, guide the way, pull the cart, and are also a protein-rich food. Dogs help people with many things such as house keeping, hunting, and are considered the most loyal and affectionate animals to humans. Today, the demand for pet dogs is growing, so small dogs like Fox, Chihuahua or intelligent dogs like Collie are interested by many players.

The ancestor of dogs, including foxes and wolves, was a weasel-like mammal that inhabited tree hollows about 40 million years ago. And the dog as we see it today evolved from a small, gray dog. At the end of the Ice Age, about 40,000 years ago, wolves and humans lived together in groups that hunted in packs. Wolves and humans often compete for prey, even killing each other. But the wolf must have begun to scavenge for the scraps of food left behind by humans. Humans domesticated wolf pups and through crossbreeding for generations, wolves evolved into today’s domestic dogs.

A hybrid dog
In 1758, the taxonomist Carl Linnaeus published in his Systema Naturae the taxonomy of species, in which Canis (canine genus) is a Latin word for dog. He classifies domestic dogs as Canis familiaris (Linnaeus, 1758) and on the next page on a separate species he classifies wolves as Canis lupus (Linnaeus, 1758).[1] In 1926, the International Commission on Zoological Nomenclature (ICZN) made the point 91 that the domestic dog Canis familiaris (Linnaeus, 1758) was included in the official list. In 1957, the ICZN specified in thesis 451 that ”Canis dingo (Meyer, 1793) was the name used for the dingo and was included in the official list of the species. Dogs are also bred by humans to create many different dog breeds, very diverse. A hybrid dog breed is a dog breed that is grafted by two different parent dogs (color, shape, …). These two parents, after mating, will create a new breed of dog that has the attributes of its parents and ancestors.

Dog breed
Breeds are groups of closely related and similar domestic dogs, all of which have distinctive traits selected and maintained by humans. Breed is also used to refer to natural breeds or breeds that arose through time in response to a particular environment including humans, with little or no human selection.

Dog breeds are not scientifically defined biological classifications, but rather groups defined by hobbyist clubs known as breed clubs. A breed is represented by a sufficient number of individuals to steadily pass on its specific characteristics over many generations. A dog is said to be purebred if their parents have been purebred and if the dog meets the standards of the breed. The obvious genetic differences between dog breeds have made specific breed dogs good subjects for medical research and human genetics.

Senses like sight, hearing, and smell are well developed: Dogs have large eyes, erect ears and a sensitive nose, so they can successfully track their prey, whether hunting alone or in groups. All dogs except the South American bush dog have long legs adapted to running fast when hunting. Dogs are “toe-walkers” and have characteristic paws, five toes on the front feet and four toes on the hind legs. Sometimes domestic dogs have five toes on their hind legs (the fifth nail is called the hypotenuse). Jackals have long tails, thick fur, usually uniform color and no striped spots.

The average gestation period for dogs lasts about 60 to 62 days, which can be earlier or as long as 65 days. At birth, puppies have no teeth, but after only 4 weeks of age, they can have 28 teeth. Like all mammals, after the young are born, the mother breastfeeds and cares for the young

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