Like size is pretty much controlled by one gene on chromosome 15 called Insulin-like growth factor-1 IGF1 , which is known to influence body size in humans and mice.
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With all that genetic tinkering, some weird stuff happened. Not surprisingly, breeding for aesthetic purposes has some.. Like pug encephalitis and hip problems in German shepherds.
In dogs with short snouts, their brains have rotated 15 degrees backward, and the smell region in their brain is in an entirely different place from other breeds. And these kinds of brain changes are common with other dogs too. Another study also published in PLOS One found that Chiari malformation in dogs changes their skull and brain formation.
It can cause chronic conditions like headaches, problems with walking or even paralysis. Thankfully some responsible breeders are using genetic science to ensure they are breeding to maintain genetic diversity, resulting in new breeds that are both healthy and happy.
Which dog breed is right for you?
One of the earliest breeds believed to be purposefully selected for its preferred traits is still around today — the greyhound. Over time, because of natural mutations, climate and human preferences, "breeds became ever more numerous and specialized until they reached the point of modern classification," according to "Guide to Dogs. But the standards for breed recognition vary from country to country — the American Kennel Club currently recognizes only breeds. Recently, the number of deliberately crossbred "designer dogs" has been growing. These include the labradoodle a cross between a Labrador and a poodle , the cockapoo a cross between a cocker spaniel and a poodle and the puggle the offspring of a pug and a beagle.
Other considerations include observations by AKC field staff, competitions, and specialty shows. The process often takes years.
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These requirements largely explain why only 34 new breeds have been recognized by the AKC in the last 10 years. Many of these breeds originated outside of the United States and are already recognized by organizations in other countries. Some of the breeds, such as the Xoloitzcuintli, are ancient and little changed over millennia, but perhaps only recently introduced to this country.
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- The selective breeding of dogs.
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Most of the newly recognized breeds are working dogs, hunters, and herders, bred for challenging climates and conditions in Scandinavia, Central Europe, and elsewhere.