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Based on the diversity of today’s pup breeds, scientists believe that the dog was produced by crossing many related species from the dog family. Among them, Charles Darwin  and the ethologist of Austria, Konrad Lorenz, were the initiators of the idea of evolution, who figured the ancestors of the domestic dog were a wolf and a jackal. Today’s established opinion, supported by the results of genetic analyzes, is certainly that the domestic canine developed from a small group of wolves, domesticated about 15,000 years back.
It is not known just how the domesticated pet was held. It is possible that canines were the people who produced the first step. Namely, if wild dogs started to be small enough to end up being unsafe, to go to human discarded bones, they might collect waste and camps. Thus, individuals tolerated them since they were cleansing their surroundings probably. It is possible they have begun to fascinate, approach them, and then domesticize them as safeguard canines and companions. It had been only when agriculture has been progressing that the herds could possibly be preserved. Or otherwise: the dogs followed a smarter series in the hope to getting anything from prey.
The first remains of a domestic puppy were found out in Mesolithic sites in various places. It seems that the earliest European breed was quite small and would generally be best compared to today’s small doggy.
Many breeds originate from a small number of animals, that leads to mating in kinship. The result is several hereditary (genetic) illnesses common in some breeds, for instance hip dysplasia (specifically in German shepherds), epilepsy, ataxia, oculoskeletal dysplasia, among others