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A 'dog breed' is a particular strain or dog type that was purposefully bred by humans to perform specific tasks, such as herding, hunting, and guarding. When distinguishing breed from type, the rule of thumb is that a breed always "breeds true".[1] Dogs are the most variable mammal on earth, with artificial selection producing around 450 globally recognized dog breeds. These breeds possess distinct traits related to morphology, which include body size, skull shape, tail phenotype, fur type, and coat colour. Their behavioural traits include guarding, herding, and hunting, and personality traits such as hypersocial behavior, boldness, and aggression. Most breeds were derived from small numbers of founders within the last 200 years. As a result, today dogs are the most abundant carnivore species and are dispersed around the world.[2]

Montage showing the morphological variation of the dog.

A dog breed will consistently produce the desirable physical traits, movement and temperament that were developed over decades of selective breeding. For each breed they recognize, kennel clubs and breed registries usually maintain and publish a breed standard which is a written description of the ideal specimen of the breed.[1][3][4] Other uses of the term breed when referring to dogs include pure breeds, cross-breeds, mixed breeds and natural breeds.[5]

The origins of dogs date back thousands of years, having evolved as domesticated descendants of the wolf, whereas modern dog breeds date back to the late 19th century. Prior to the Victorian era, there were different types of dogs that were defined by their function. Many different terms were used to describe dogs, such as breed, strain, type, kind, and variety. By the end of the Victorian era, society had changed and so did the role of dogs. Form was given a more prominent role than function.[6][4] Different types or breeds of dog were being developed by breeders who wanted to define specific characteristics and desirable features in their dogs.[4] Driven by dog shows and the groups that hosted them, the term dog breed took on an entirely new meaning. Dog show competitions included best in breed winners, and the purebreds were winning.[6] Breed standards are the reason the breed came to be, and with those standards are key features, including form, function and fitness for purpose. The Kennel Club in the UK was founded in 1873, and was the world's first national kennel club and breed registry.[7] They became the guardians of their country's breed standards. Over time, other breed registries followed [login to view URL] study may have an answer. The study, which aimed to determine the "optimal age" of puppy cuteness, found that puppies are most appealing to humans at around 6 to 8 weeks of age. That's around the time when puppies are weaned from their mothers, leading the researchers to hypothesize that puppies reach peak cuteness right when they need human care the most.

"Just as their mother is getting sick of them and is going to kick them out of the den and they're going to have to make their own way in life, at that age, that is exactly when they are most attractive to human beings," lead study author Clive Wynne, a professor of psychology and director of Arizona State University's Canine Science Collaboratory, said in a statement.

The new findings may help scientists better understand how dogs evolved to rely on human care, the researchers said.

"This attraction of humans to dog pups at that phase of life may have given early dogs, and may continue to give today's free-living dogs, a competitive advantage by being adopted and cared for by humans," the researchers wrote in the May 3 issue of the journal Anthrozoös. [Photos: World's Cutest Baby Wild Animals]

Cute and cutest

Dogs evolved from wolves, but the two types of canines have notable differences; for example, wolf puppies are reared by their parents for up to two years, while dog puppies are abandoned by their mothers after.

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Im very good at writing & fast too... I can assure that i will make this project very Delightful... iwill try to complete as soon as possible

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