Dogs (Latin Canis lupus familiaris) belong to the phylum Chordata , vertebrate subphylum, Mammalia , Eutheria, Carnivora , suborder cracked feet, canids. Chinese known as "dogs", dogs distributed around the world. Dogs and horses , cattle , sheep , pigs , chickens and that " domestic animals " . Some scientists believe that early humans from dogs is the gray wolf domestication, domesticated time in 40,000 years ago to 1.5 million years ago . It is known as "man's best friend" , the highest rate of pet keeping, its life of about 12 to 18 years . In Chinese culture, the dog belonging to the Zodiac , one of the zodiac 11 bits.
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Author: ylbtech
Source: http://ylbtech.cnblogs.com/
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