catahoulas with a lot of white

I know this is about cats but the dogos have the same problem, and in the years I have delt with them I have noticed the uni lats or bi lats all lack pigmentation in or around the ear area and eyes. Not always but at least 80-90% of the time. I wonder if the merle trait in cats causes the lack of pigmentation around their eyes and ear and causes this as well? I have always said I wished the dogo breed had color to them LMAO thus why I like pirates and heavy skin pigmentation on the ones I have lol.

Interesting reading here on this thread. Thanks for the information on the double merle and ghost merles.