In this case, it might extend beyond rats being uglier. There is research supporting the idea that the human/dog relationship is a case of coevalution [1] [1]h

In this case, it might extend beyond rats being uglier. There is research supporting the idea that the human/dog relationship is a case of coevalution [1] [1]http://theacademy.typepad.com/files/coevolution03.pdf http://theacademy.typepad.com/files/coevolution03.pdf