The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the domestic dog, it is derived from extinct gray wolves, and the gray wolf is the dog's closest living relative. The dog was the first species to be domesticated by humans. Experts estimate that hunter-gatherers domesticated dogs more than 15,000 years ago, which was 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.
The Taiwan Dog (Chinese: 台灣犬) is a breed of small or medium dog indigenous to Taiwan. These dogs are also known as the Formosan Mountain Dog. They are well-adapted to the uneven and thickly forested terrain of Taiwan, having become a semi-wild breed prior to the arrival of several colonial reigns and foreign powers. Notwithstanding these adaptations, Formosans retained the potential to be trained and are now used as hunting dogs, guard dogs, stunt dogs, rescue dogs, or simply as companions. Formosans are classified into one medium type and two small types. (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.
A scanning electron micrograph (SEM) depicting a number of Gram-negative Bordetella bronchiseptica bacteria.
Kennel cough (also "canine infectious respiratory disease" (CIRD), "canine infectious respiratory disease complex" (CIRDC) or "canine infectious tracheobronchitis" (CIT)) is an upper respiratory infection affecting dogs. There are multiple causative agents, the most common being the bacterium Bordetella bronchiseptica (found in 78.7% of cases in Southern Germany), followed by canine parainfluenza virus (CPIV; 37.7% of cases), and to a lesser extent canine coronavirus (9.8% of cases). It is highly contagious; however, adult dogs may display immunity to reinfection even under constant exposure. Kennel cough is so named because the infection can spread quickly among dogs in the close quarters of a kennel or animal shelter.
Viral and bacterial causes of canine cough are spread through airborne droplets produced by sneezing and coughing. These agents also spread through contact with contaminated surfaces. Symptoms begin after a several day incubation period post-exposure, and in most cases will clear up on their own. However, in young puppies or immunocompromised animals, mixed or secondary infections can progress to lower respiratory infections such as pneumonia. (Full article...)
Image 3A 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 4An 1897 illustration showing a range of European dog breeds (from Dog breed)
Image 17Tesem, an ancient Egyptian sight-hound (from Dog breed)
Image 18Schematic 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)
Image 38The 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 39Example of a dog making prolonged eye contact with a human (from Domestication of the dog)
...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 Fred Gipson was an American author best remembered for creating a fictional dog featured in a book and the classic 1957 movie Old Yeller?
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