In some cases, these health problems have appeared as ancular by -products. Because breeds are a genetically closed population, a mutation causing a disease that just occurs in one dog may be commonly common in future generations. “Especially if the animal with this mutation is otherwise a pattern of price,” Dr. Serpell. “Because everyone will want to want the individual.”
As a result, many modern breeds suffer from diseases that dog lovers would never have lifted intentionally. Labrador retrievars are susceptible to a degenerative eye disease known as progressive retinal atrophy, while Cavalier King Charles Spaniels often develops a heart condition called mitral valve disease.
In other cases, however, the problem in itself may be the physical features that breeders are looking for, especially because these properties are increasingly over -exalted. The standard breed for bulldogs explicitly requires “very short” muzzle, but over time the muzzle of dogs disappeared, said Dr. Serpell, resulting in serious breathing problems.
Mutts and mixed dogs can be healthier than purebred, especially if they have a small amount of DNA from many different types of breeds, said Dr. Bannasch.
However, some of the Mixed Purrows can still be very inbred, she said and some health problems are common for more breeds. For example, many large breeds are susceptible to bone cancer; Mixing several of them may not have much benefit. “You can’t combine all” mixed breeds “together,” she said.
The connection between the breed and behavior is darker.
When creating modern breeds, people generally place much stronger emphasis on appearance than behavior, which is also shaped by training and early dog environment.
“Behavioral features are definitely different from the breed to the breed, but not by far as strong as morphological features,” Dr. Boyko. “You will never get Kollii that looks like a great Dane,” he added. “But I see a lot of dogs show the behavior of direction that are not indicators.”
Scientists revealed some general formulas. Terriers who were kept hunting and killing pests, more likely to expose “For example, predatory persecution” than grazing dogs. And on average, Siberian husky is more likely to be howling than Labrador’s retrievals.
But in general The breed is a bad predictor Scientists have found that behavior is more variations than between them. Someone who wants a friendly, loading a loving dog who does not say can not ban when he gets it exactly by bringing home the Labrador retriever. “You can have exactly the opposite,” said Dr. Lord.