Though dogs and grey wolves are sister taxa, they are mostly much more honest and loyal to human, that’s why we say dogs are men’s best friend. Being the first species to be domesticated at around 13500 years ago, there are over hundreds of types nowadays. Dogs are highly variable in their size and weight, they could be as small as a Chihuahua(around 10cm), or as large as a Great Dane(1m).
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