The tiny, fluffy Chihuahua shuffling past you on the street may be part wolf.

According to a new study led by scientists at the American Museum of Natural History and the Smithsonian's National Museum of Natural History, close to two-thirds of all dog breeds have a detectable amount of wolf DNA.

This wolf ancestry revelation was published in Proceedings of the National Academy of Sciences on Nov. 24.

"Altogether, the majority of dogs today have low, but detectable levels of postdomestication wolf ancestry that has shaped their evolution and conferred unique advantages to their survival in diverse human environments," reads the study's introduction.

Per CBS News , the wolf DNA detected in two-thirds of dogs during this study is not genetic material left from when dogs evolved fro

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