And then there is the pitweiler. These are intentional crosses of pit bulls with rottweilers. I imagine that when the blood hits the wall, the owner claims this one is a rottwieler to avoid “Stigmatizing” the pit bull:
http://www.dogbreedinfo.com/p/pitweiler.htm
And an example of a pit bull with rottie coloring: http://www.youtube.com/watch?v=Am2_Hv4hV4c