Dobermans come in 4 colors. the lighter colors are a double recessive so a little rarer. A common misconception is they have more skin issues. we've not found this true in our lines the past 40 years. good quality nutrition and health care would seem to have a factor in coat and over all condition.
Isabella - commonly called fawn
Blue = shades can vary
Red and rust one of the 2 predominate colors
Black and rust = one of the 2 predominate colors
Cavalier king Charles spaniels have 4 basic colors also.