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The most accepted theory is that the dog is descended from the species of wolf (Canis lupus), and it is unclear if the man came to the wolf or the opposite descendant of the wolf, the first domestic dog is about 12 thousand years. Regardless of any arguments both took advantage of the situation: the man wore a wolf hunting, guarding livestock, and as a guard against enemies. Instead, the man fed him.

In ancient times

The people of ancient Egypt and Western Asia were the first to raise different kinds of dogs, including Mastiffs and Greyhounds. In Roman times was because most shapes and sizes of dogs currently known. Greyhounds and dogs used for hunting prey, while large Mastiffs are considered ideal for fighting and for war. In the ancient world had dogs for hunting, herding, as caretakers for the sport and as a company today.

When the man started demanding other things about the wolf behavior and appearance. Since then, began to grow the variety of dog breeds and dogs have been bred for appearance, behavior and ability to touch, what is currently happening, but even though it has maintained a fine selection of races, sometimes tend to be problems because they are not "compatible" some races.

The consequences of crossing over the years
Humans attempting to cross dogs to improve the characteristics or appearance, because of this method, the animals suffer more defects and genetic diseases as it passes naturally. Some problems the dog come to have large and small, the Chihuahua's head is larger in relation to your body, so it must be birth by Caesarean section and that does not fit the natural side of birth. For the boxer is sometimes difficult to breathe because his nose is too small, also called "flat nose." The daschund, also known as sausage dog has been a back problem since due to the size of it, can cause paralysis and constant pain.

(Divisions and some features of the dog through the evolution

Guard Dogs: They exhibit the features controlled hunt. Members of this group, such as Border Sheepdogs, Belgian Malinois and German Shepherds use tactics of hunter and cop to intimidate and keep herds. Your natural instinct to bring down an animal in his office is training to come about. Other group members, including Welsh Corgis, Canaan Dog and Livestock herding dogs with more aggressive behavior (such as biting and nipping at the heels of animals) and making use of the body plan to circumvent the defenses office.

Hunters: Among this group are, (pointer) indicators, setters, spaniels and retrievers. Have been used for hunting but are kept in a minor role, while not participating in the actual attack. Identify and immobilize prey, but declines to aggressively approach the dam.

Scenthounds: Keep an interim agreement type and model of behavior that makes them really continue tracking their prey scent, but tend to restrain the actual individual attacks in favor of convening the leaders of the game (in this case, humans) vocally to do the job. They often have a characteristic vocalization called a bay. Some examples are the Beagle, Coonhound, Dachshund, Fox Hound, Otterhound and the Hound.

Sighthounds: That goes on and attack when he realized the dam keeps the mature canine size and some features, such as narrow chest and lean bodies, but has lost the right ears of the wolf and thick double layered coats greatly. Some examples are the Afghan Hound, Borzoi, Saluki, Sloughi, Pharaoh Hound, Azawakh, Whippet and Greyhound.

Mastiff: They are big dogs, tall and solid with strong chest, big bones and thick skulls. Traditionally been conceived for war, protection and guard work.

Bulldog: medium dogs are bred for fighting wild and domestic animals (sometimes were used to fight each other). These dogs have a massive skull, square and large bones with a figure very muscular and broad shoulders.

Terrier: The terrier have aggressive behavior as adults, famously coupled with a lack of submission youth and deployed similarly physical traits as adults correspondingly right ear, although many breeds have been selected for size and sometimes dwarfed legs to have enabling them to pursue prey in their burrows.)

Boxer: The origin of this breed is Germany. The Boxer breed is very young, and that was accomplished a century ago about the junction between various races. Boxer in the veins runs the blood of at least five races, all of them old dogs grip with wide, upturned noses: the Bullbeinser (bull biter), the Baerenbeisser (bear biter), Brabant in Belgium, Dazing of Poland and the English Bulldog.

Until today there are over four hundred species of dog types, different sizes, shapes, colors and functions. The dog is a carnivorous mammal that has been considered the first domesticated animal. The domestic dog or just dog has lived with humans as co-worker or pet in all cultures since antiquity. There are several races within the species. Dogs, in general, can have two litters of puppies per year. Gestation lasts 63 days and having 1 to 10 pups per litter, although some can exceed this number, reach sexual maturity between 1 and 3 years, all depending on the breed.

Has been considered the best friend for thousands of years and has been considered the most accurate from the outset.