I guess that depends on what your definition of 'Dominant' is. Co Dominant and Incomplete Dominant mutations would also be considered Dominant type mutations. I think what you're asking is what I've heard termed 'Simple Dominant' Which means that The mutation is Dominant to 'Normal' but that the heterozygous form and the homozygous form look the same. As to that, I don't think any mutations have been proven simple dominant yet. Spider is the leading contender but even that hasn't been proven as there are no proven homozygous spiders. And there is rumored to be a homozygous pinstripe that looks different but BHB isn't releasing pics of it yet and Bryan probably won't release them until he has proven it to his own satisfaction.

Mark