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Dogs are mammals that belong to the family Canidae, such as wolves, foxes and coyotes. Usually, the term dog is used to mean the domestic subspecies Canis lupus familiaris.
Ancestry and history of domestication
Molecular systematics indicate that the domestic dog is descended from a wolf-like ancestor, and dogs and wolves can still interbreed. The domestication of the dog probably occurred at least 14,000 years ago, and perhaps long before that: there is archaeological evidence of dog remains, showing the characteristic morphological differences from wolves, from at least 14,000 years ago, while wolf remains have been found in association with hominid remains that are at least 400,000 years old. The molecular genetic data suggest that the domestic lineage separated from modern wolves around 150,000 years ago.
Dog society
Dog societies are characterized by a companionate hierarchy, in which each individual has a rank in society, and in which there is intense loyalty within the group. Dogs thrive in human society because their relationships with humans mimic their natural social patterns. The dog is always aware of its rank vis-a-vis other individuals in the group, and it may be noted that an assertive dog often considers itself the alpha animal, while considering its human owner to be subordinate
Dog breeds
There are numerous dog breeds, which evolved during the domesticated dog's relationship with man over the last 100,000 years. Many breeds are the product of a deliberate process of artificial selection. Because of this, some breeds are highly specialized, and there is extraordinary morphological diversity across different breeds. Despite these differences, dogs are able to distinguish dogs from other kinds of animal.
The definition of a breed is a matter of some controversy. Some groups use a definition that ultimately requires extreme in-breeding to qualify. Dogs that are bred in this manner often end up with severe health problems. Other organizations define a breed more loosely, such that an individual may be considered of one breed as long as, say, three of its grandparents were of that breed. These considerations come into play among breeders who enter their dogs in dog show competitions.
In February 2004, the Canine Studies Institute in Aurora, Ohio, managed to arrange all species of dog into ten categories, accoriding to Darwinian Evolutionary principles. For more on this see http://news.independent.co.uk/world/science_medical/story.jsp?story=491197]]
For dog lovers, you may like to read How to choose your pet and take care of it.
Chocolate contains theobromine, a chemical stimulant similar to caffeine. This chemical is lethally toxic to animals such as dogs and horses because they are unable to metabolize it effectively. If they are fed chocolate, the theobromine may exist in their bloodstream for up to 20 hours, and these animals may experience epileptic seizures, heart attacks, internal bleeding, and eventually death. Induce vomitting within two hours of ingestion, or contact a veterinarian.
Interactions between dogs and humans
The relationship between dogs and humans is ancient. Dogs serve humans in many ways. Dogs as working partner
There are guard dogs, hunting dogs, and shepherd dogs. Dogs have served as guides for the blind, as commandos, have flown into outer space (see Laika), and a dog (P.H. Vazak) was even credited as author of an Oscar-nominated screenplay.Dogs as sporting partner
Many people compete with their dogs in a variety of dog sports, including agility, flyball, and many others. This often strengthens the bond between human and dog, since they must trust one another in a variety of environments and must learn how the other works and thinks.Dogs as pet
Relationships between humans and dogs are often characterized by strong emotional bonds, which run both ways. Consequently, dogs are very popular as pets and companions, independent of any utilitarian considerations. Many dog owners consider having unconditional acceptance from a friend who is always happy to see them to be quite utilitarian, particularly if the dog also leads them to regular exercise. Dogs are quite dependent on human companionship and may suffer poor health without it. Some research has shown that dogs are able to convey a depth of emotion not seen to the same extent in any other animal - this is purportedly due to their closely-knit development with modern man, and the survival-benefits of such communication as dogs became more dependent on humans for sustenance.
A portrait of an adult female cockapoo.
Chocolate is lethally toxic to dogs
Never feed chocolate to your dog! Dogs as food
In certain cultures, dogs are grown on farms and slaughtered as a source of meat. Consequently, the conflicts between dog lovers and dog eaters occasionally appear as headline news. In other cultures, dogs have served as a standby source of food. One example is in China where chow chows were often posted to guard family storehouses. During a hard season when the food store was depleted, the dog would be then slaughtered as an emergency ration.Miscellaneous
The Dog is one of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar. It is thought that each animal is associated with certain personality traits. See: Dog (Zodiac).Related Topics
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