Among the three genetically accepted standard color groupings, which variation is frequently cited as the rarest encountered in the general population of show dogs?

Answer

Red

When limiting the scope to the three primary standard groupings (Black and Tan, Liver and Tan, Red), the solid Red variation is frequently cited as the rarest in the general population of show dogs.

Among the three genetically accepted standard color groupings, which variation is frequently cited as the rarest encountered in the general population of show dogs?
colorbreedBloodhound