During domestication people may have selected for brown-eyed dogs because they appear more companionable.American author and humorist John Kendrick Bangs wrote:
Here we have an affectionate poem dedicated to a brown-eyed dog. Why do we almost never encounter loving odes about blue or yellow-eyed dogs? One obvious reason is that most domestic dogs have brown eyes. A quick scan through the breed standards from the American Kennel Club finds that only around 8 percent of dog breeds have any eye color that is acceptable other than brown.
The results across the two studies were quite consistent. The data showed that the facial images of dark-eyed dogs were perceived as more friendly and puppy-like than those of the light-eyed dogs. Furthermore, the observers expressed a greater desire to interact with the dark-eyed dogs. The simple conclusion was that dark eyes on a dog tend to send a non-threatening and more inviting gaze signal to human beings. Those soulful brown eyes might stir some, people to write poems about their dogs.
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