While there is still controversy over how domesticated dogs came to be (either due to evolution of the species or efforts of man) they are descendants of the wolf.
It is generally believed that dogs were domesticated around 15,000 years ago.
Dogs are color blind, the equivalent to red-green color blindness in humans (where reds and greens appear to be beige).
Dog can hear sounds at four times the distance of humans.
While the sense of sight is dominant in humans, smell is the dominant scent in dogs.
Dogs are highly susceptible to theobromine poisoning (chocolate poisoning) because the digestive process in dogs breaking down theobromine is so slow that even a small amount of chocolate can be fatal.
The median life expectancy for dogs is 10 to 13 years, though some breeds may live longer or shorter than this range.
It is estimated that between 3 and 4 million dogs and cats are put down each year, which is why the SPCA and humane societies recommend your pet be neutered and people adopt from shelters rather than purchase a pet.
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