You never know what is going to pop up. There is a recent story of a dog:
One couple adopted a stray dog they named Walter because he looked like a Golden Retriever. His DNA test revealed he had 0% Golden Retriever DNA and was a mix of Australian Cattle Dog, Poodle, German Shepherd, and other breeds.
Some of my family are of mostly Polish and Slovak heritage. In some photos, they look part East Asian. Reminds me that there were Asian invasions into Europe many years ago.