The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the domestic dog, it was domesticated from an extinct population of wolves during the Late Pleistocene, over 14,000 years ago by hunter-gatherers, prior to the development of agriculture. The dog was the first species to be domesticated by humans. Experts estimate that 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.
"Water Spaniel" (most widely accepted image of a Tweed Spaniel)
The Tweed Water Spaniel, or Tweed Spaniel, is a breed of dogextinct since the 19th century. It is best known for being involved in the early development of the modern Curly Coated Retriever and Golden Retriever breeds of dogs. They were described as generally brown, athletic dogs from the area around Berwick-upon-Tweed near the River Tweed and close to the Scottish Borders. A type of water dog, the breed was not well known outside the local area. This breed may have been created by crossing local water dogs with imported St. John's water dog, another breed which is also now extinct. (Full article...)
Retrievers, such as this Labrador Retriever, are a type of gun dog bred to retrieve downed birds from water or land. Although spaniels and some pointing breeds routinely retrieve game, retrievers are skilled in finding game, and are distinguished in that non-slip retrieval is their primary function. As a result, retriever breeds are bred for "soft" mouths and a great willingness to please, learn, and obey. A soft mouth refers to the willingness of the dog to carry game without damaging it. Retrievers are often selected as family pets, and many suburban dogs end up retrieving newspapers and sticks like this dog.
Dog intelligence or dog cognition is the process in dogs of acquiring information and conceptual skills, and storing them in memory, retrieving, combining and comparing them, and using them in new situations.
Studies have shown that dogs display many behaviors associated with intelligence. They have advanced memory skills, and are able to read and react appropriately to human body language such as gesturing and pointing, and to understand human voice commands. Dogs demonstrate a theory of mind by engaging in deception, and self-awareness by detecting their own smell during the "sniff test", a proposed olfactory equivalent to the mirror test. (Full article...)
Image 30A drawing by Konrad Lorenz showing facial expressions of a dog - a communication behavior. X-axis is aggression, y-axis is fear. (from Dog behavior)
Image 37The difference in body size between a Cane Corso (Italian mastiff) and a Yorkshire Terrier is over 30-fold; both are members of the same species. (from Dog anatomy)
Image 41Schematic anatomy of the ear. In dogs, the ear canal has a "L" shape, with the vertical canal (first half) and the horizontal canal (deeper half, ending with the eardrum) (from Dog anatomy)
... that after U.S. Navy pilot Royce Williams engaged in a solo dogfight with seven Soviet MiG-15s during the Korean War, he was ordered never to tell anyone about it?
...that the stray dogs Bummer and Lazarus(pictured) were so popular with the people of San Francisco in the 1860s that they were given special exemption from the leash laws?
...that Manuel Benito de Castro assumed the Presidency of Cundinamarca, with the condition that he would be allowed to leave Congress at a certain time to feed his dog?
...that the namesake for Hondo Dog Park in Hillsboro, Oregon, won an award for valor just weeks before being killed in the line of duty?
...that most of the dogs seen in the 2007 Thai film, Ma-Mha, were strays rescued from shelters and trained specifically for the film?
...that the original Rin Tin Tin was named for a puppet called Rintintin that French children gave to the American soldiers for good luck?
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