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Based on the diversity of today’s pup breeds, scientists believe that the dog was formed by crossing several related species from the dog family. Among them, Charles Darwin  and the ethologist of Austria, Konrad Lorenz, had been the initiators of the idea of evolution, who figured the ancestors of the domestic doggie were a wolf and a jackal. Today’s established opinion, supported by the outcomes of genetic analyzes, will be that the domestic puppy developed from a small band of wolves, domesticated about 15,000 years back.
It is not known exactly how the domesticated pet was held. It is possible that dogs were the people who produced the initial step. Namely, if crazy dogs started to be small enough to be unsafe, to visit human they might collect waste materials, camps and discarded bones. Thus, people possibly tolerated them since they were cleaning their surroundings. It is possible that they have started to fascinate, approach them, and domesticize them as safeguard dogs and companions. It was only once agriculture has been progressing that the herds could be preserved. Or elsewhere: the canines followed a smarter series in the hope of getting anything from prey.
The initial remains of a domestic pet were found out in Mesolithic sites in different places. It seems that the earliest European breed was quite little and would usually be best compared to today’s small canine.
Many breeds originate from a small number of animals, which leads to mating in kinship. The result is different hereditary (genetic) diseases common in some breeds, for instance hip dysplasia (specifically in German shepherds), epilepsy, ataxia, oculoskeletal dysplasia, and others