Yeah, I know...DANG!Uh.. Todd. There's no way that you are going to convince a bunch of folks who live and breathe Dobermans that a "cream and white" Doberman is not albino. Kind of like your not going convince a bunch of Blues fanatics that Johnny Winter is "cream and white" LOL...
Rock and Roll Hoochie Koo baby!
Edit to say: Darn bug! We can't "convince" them AND they can't "convince" us.
I don't know how successful I'm going to be in explaining this since I'm not a geneticist but. There was an older theory about how melanism in the Doberman works. It has absolutely nothing to do with having albino ancestors. Albinism is an overlay not a matter of dominance at all. It is a masking color (actually a masking non-color) which obscures the actual coat color--prior to the development of an actual gene test for albinism if you gene tested an albino the results would come back as black, red, blue or fawn. That's because you were testing for the base color and you didn't have a way to test for the masking genetics of albinism.My bad, I thought that z factor was synonymous with the albino gene. Sort of like a shorthand way of marking the dog as a carrier. I spoke with a geneticist and he explained that the primarily melanistic coloring would have to come from dogs with an albino ancestor because it is what allows for complete dominance of the primary color opposed to having co-dominance which creates the markings.
But it still boils down to something you need to also know about the tan marking genetics. The tan marking is part of an array of possibilities. It can be as isolated an area as a saddle or the typical Doberman pattern of feet/legs, muzzle, chest markings, butt markings, eyebrow dots and even in a Dobe those can vary in size. But in a melanistic Doberman something is awry with that pattern and it allows the coat color to leak into the normally clean tan (or rust) markings.
The fact that if you gene tested albino dogs for color because what the results would come up as would be the underlying color--endless breeders of albino dogs insisted that the dogs weren't albino's at all and they could prove it with a coat color genetic test.
It enough to make you want to bang your head against the nearest wall.