ScienceGenes Of Pure American Dog Breeds Survived Merely As Tumors After European Breeds Took Over A study found that the very first American dogs were mostly wiped out by the European breeds brought by the colonizers. What was left of these ancient American dogs was a gene that survived as a cancer tumor among dogs.by Athena Yenko
ScienceAncient Humans Domesticated Dogs Not Just Once But Twice And In Two Different Placesby Rhodi Lee
ScienceDogs And Wolves Split Family Trees 40,000 Years Ago, Much Earlier Than Believed: Studyby James Maynard