"some [scientists] said dogs evolved as two separate species 135,000 years ago in two parts of the world. now, researchers say, those theories are wrong." what evidence in the text supports the conclusion that those theories are wrong? each year we spend billions of dollars on our canine pals. asian wolves came to the americas with christopher columbus in 1492. scientists found that the genes of the ancient american dogs were similar to the genes of dogs born in europe and asia. five female asian wolves developed an uncanny ability to pick up human signals.