http://members.aol.com/CYorkie/Genet...Chocolate.html
The red or chocolate born are affected by the bb genes. The red or chocolate born, referred to as liver in some breeds will also have self colored pigment, such as red, chocolate or liver nose. The Yorkshire Terrier should only be carrying the dominant BB genes. I have not heard of health problems with the red/chocolate born puppies, like with the blue born puppies. Yet most of these situations occur with backyard breeders and puppy mills and they are not likely to share the history of problems with the show breeders. Once again this is a recessive being passed on to the puppies from the parents. This breeding should definitely not be repeated.