One study shows that domestication helped change the color of dogs' eyes, making them more friendly and youthful.
Călin Nicolescu
IT&C knowledge
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The study, by Japanese researchers, suggests that human selective pressure favored dogs with darker eyes, which were perceived as friendlier. Dark irises are thought to be unconsciously associated with being juvenile and vulnerable, making dogs more attractive to humans.
Sources
Studiu. Câinii şi-au modificat culoarea ochilor
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