Chihuahuas share DNA with coyotes
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Scientists at Stanford University discovered that Chihuahuas, a small dog breed, share genetic material with coyotes.
Researchers used new software programs, Gnomix and Gnofix, to analyze the genomes of many animals and trace their evolutionary history. This analysis, called local ancestry inference, revealed unexpected connections in the Chihuahua’s genetic code. The study confirmed that both Chihuahuas and Xoloitzcuintli (Xolo), another Mexican dog breed, have roots in North America, stemming from a mix of European and pre-Columbian dogs.
Specifically, the Chihuahua genome contains segments of DNA originating from coyotes. While the research shows this genetic mixing occurred before the arrival of Christopher Columbus in the Americas, the exact timing and whether it was intentional or accidental remain unclear. Researchers also found that the Xolo breed carries over four percent of genes from Arctic dogs. The study doesn’t yet explain which traits Chihuahuas inherited from coyotes, though their large ears and distinctive vocalizations may be linked.
Experts believe the Chihuahua’s small size is likely the result of humans selectively breeding dogs with desired characteristics.
