**The roan gene in dogs acts as a simple dominant gene. The action of the gene results in a mingling of colored and white hairs. To be roan a dog must have white areas; a solid colored dog can not be roan. Breeds where the roan gene commonly occurs are English Cocker Spaniels, English Setters, Australian Cattle Dogs, and German Shorthaired Pointers. The roan pattern also occurs in American Cocker Spaniels, Field Spaniels and Border Collies.
Roan dogs are more prone to deafness due to the absence of pigment during ear formation. There are no other health issues associated with this gene.
Black and white roans are referred to as "blue roans" (spaniels) or "blue belton" (English Setters). Red/buff and white roans are referred to as "red roans" "orange roans" or "lemon roans" or oran. Brown and white are referred to as "liver roans", "chocolate roans" or "brown roans".**There are no health problems associated with the temporary "roaning" of RR pups. It's just one of those mysterious things.