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The dog or domestic dog (Canis familiaris) is a domesticated descendant of the wolf, characterized by an upturning tail. The dog derived from an ancient, extinct wolf, and the modern grey wolf is the dog's nearest living relative. The dog was the first species to be domesticated, by hunter–gatherers over 15,000 years ago, before the development of agriculture.

Due to their long association with humans, dogs have expanded to a large number of domestic individuals and gained the ability to thrive on a starch-rich diet that would be inadequate for other canids. Over the millennia, dogs became uniquely adapted to human behavior, and the human-canine bond has been a topic of frequent study.

The dog has been selectively bred over millennia for various behaviors, sensory capabilities, and physical attributes. Dog breeds vary widely in shape, size, and color. They perform many roles for humans, such as hunting, herding, pulling loads, protection, assisting police and the military, companionship, therapy, and aiding disabled people. This influence on human society has given them the sobriquet of "man's best friend." (Full article...)

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A Clumber Spaniel

The Clumber Spaniel is a breed of dog of the spaniel type, developed in the United Kingdom. It is the largest of the spaniels, and comes in predominantly white with either lemon or orange markings. The name of the breed is taken from Clumber Park in Nottinghamshire where the breed was first developed. It is a gundog that specialises in hunting in heavy cover. They are gentle and loyal, and can act aloof with strangers. They have several habits which could be considered disadvantages, including a constant shedding of its coat and snoring.

The history of the breed is uncertain prior to the mid-19th century with two theories being prevalent. Clumber Spaniels have been kept and bred by various members of the British Royal Family, including Prince Albert, King Edward VII and King George V. They were introduced into Canada in 1844, and in 1884 became one of the first ten breeds recognised by the American Kennel Club. The breed can suffer from a variety of breed-specific ailments varying in severity from temporary lameness due to bone growth whilst young to hip dysplasia or spinal disc herniation. (Full article...)
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American Water Spaniel
Credit: American Water Spaniel Club

The American Water Spaniel is a gundog breed of dog developed in the market hunting days of America's history. Hunters needed a dog that could function on land as well as in the marsh and that could easily fit into a canoe or skiff without taking up much room. An American original, this flushing spaniel also doubles as a competent retriever.

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Detection dog training in U.S. Navy military for drug detection

A detection dog or sniffer dog is a dog that is trained to use its senses to detect substances such as explosives, illegal drugs, wildlife scat, currency, blood, and contraband electronics such as illicit mobile phones. The sense most used by detection dogs is smell. Hunting dogs that search for game, and search dogs that work to find missing humans are generally not considered detection dogs. There is some overlap, as in the case of cadaver dogs, trained to search for human remains.

A police dog is essentially a detection dog that is used as a resource for police in specific scenarios such as conducting drug raids, finding missing criminals, and locating stashed currency. Frequently, detection dogs are thought to be used for law enforcement purposes. Experts say that dog-sniff evidence should not be used in the criminal justice system, pointing to wrongful convictions, human biases that skew animal behavior, and the lack of systematic research into what dogs detect or how they do it. (Full article...)

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For editor resources and to collaborate with other editors on improving Wikipedia's dog-related articles, see WikiProject Dogs.

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