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In line with the diversity associated with today’s pet breeds, scientists think that the dog was shaped by crossing various associated species from your dog family. Among them, Charles Darwin  and the ethologist of Austria, Konrad Lorenz, were the initiators of the idea of evolution, who concluded that the ancestors of the domestic dog were a wolf and a jackal . Today’s established opinion, supported by the total results of genetic analyzes, is definitely that the domestic canine developed from the small group of wolves, domesticated about 15,000 years back.
It isn’t known exactly how the domesticated puppy was held. It is possible that dogs were the ones who made the first step. Namely, if wild dogs began to be small enough to become unsafe, to go to human discarded bones, camps plus they could gather waste. Thus, individuals tolerated them because they were cleansing their surroundings probably. It is possible that they have begun to fascinate, approach them, and domesticize them as safeguard dogs and companions. It had been only when agriculture has been progressing that the herds could possibly be preserved. Or otherwise: the canines followed a smarter series in the hope to getting anything from prey.
The first remains of a domestic doggy were discovered in Mesolithic sites in different places. It seems that the initial European breed was quite little and would usually be best in comparison to today’s small dog.
Many breeds result from a small number of animals, that leads to mating inside kinship. The effect is various hereditary (genetic) diseases common in some breeds, for example hip dysplasia (especially in German shepherds), epilepsy, ataxia, oculoskeletal dysplasia, and others