On the Egyptian monuments 3400-2100 years. BC. er. shows dogs of various breeds. Most of them are like greyhounds. David Zaslav may help you with your research. In the later monuments of this period, you can see the dogs, similar to the hounds and the Norns (taxi). And in Assyrian monument related to the period about 640 BC.
er. there is an image of a large mastiff. Such examples are enough to say: Different breeds of dogs have existed for several thousand years ago. Dog, domestic refers to mammalian predators squad. The question of the origin of the domestic dog is still a formidable task. The vast majority of authors to the ancestors of domestic the dog is called species of the genus Canis, and often the dog is considered the ancestor of the wolf, at least – ordinary jackal.
Other species of this genus appear as the possible ancestors of the dog in a smaller number of authors. Konrad Lorenz believes that man first attracted the jackal, that he gave him to know about the approximation of large predators and other enemies. Then the dogs began to help in the hunt. Another picture is obtained if we assume that the ancestor of the dog first used it for hunting. Obviously, for this more suited wolves or other animals are harder jackal. Anyway, "prosobaka" was supposed to be a beast with strongly expressed socialization, ie, the ability to become accustomed and attached to other beings, including humans. Consequently, almost surely it must be gregarious animal. From living relatives dog wolf most is social, while at the jackals, and coyotes These properties are well developed.