dog is Gg, the dog will be blue as the dominant gene is G which is what causes the colour blue and will exhibit that colour. When the dog is gg, the only gene they have is the non blueing gene, so they also can only exhibit that colour which will be the black colour. Dogs that are born blue carry the dilute gene of dd, which should also not be in the Yorkshire Terrier breed, although that is what would cause the Blue born puppies.
Recessive genes are wonderful if they're for the quality you want. In two generations you can totally lock something in your line (such as long hair). The problem can be with dominants, you can breed for it, but you almost always have to continue breeding for it or those little recessives keep sneaking in there. As mentioned with the Brussels Griffon story, they can be passed along for many generations before they actually appear or get the chance to appear.
When you breed together two Gg dogs, your chances of mostly blue dogs is very good. Since the dogs in question are blue dogs as they are Gg, G being the dominant and the dogs exhibit that colour, but carrying the g which is a recessive they are able to pass that recessive on to the resulting puppies from the mating. The chances of the g sperm from one dog getting with the g egg from the other are not going to be really high but it will occur. Most times the G of one will end up with the g of the other and you still end up with a blue dog. Not to say that the odds are not against you and you end up with a litter of soft coated black puppies. We all know from breeding dogs that nothing holds true 100%.
The density of the shade of blue can be bred for, by selecting dark steel blue whenever possible. This does seem to be a quality that you can lock into with fairly much regularity. As with all the other things in breeding dogs though, when you expect something, always be prepared for something else. A responsible breeder will not intentionally breed for undesirable traits. On very rare occasions, a breeder will have a puppy born with a colour which could be brown. These puppies should be spayed or neutered and placed in a pet home. DNA testing should be done to see who the carrier of the incorrect gene is and those dogs should not be use for breeding again.
Many people breed their black Yorkies, because they feel they have many benefits. This is fine, but it is best to only breed one to a blue dog. Keep in mind that the blue colour is dominant here and the black recessive. A black dog can only throw a recessive gene and if bred to another black dog the resultant puppies will also be black.
To assist responsible breeders KUSA in future will include on all new printings of registrations for Yorkshire Terriers, the colour as declared by the owner – not only for the dog in questions, but for its parents and grand parents. We believe this may help the situation in that people will be aware if a colour is not one accepted by the breed standard.
A breeder should not sell or promote the dogs of Here is an example of a Brussels Griffon litter. The such deviations in colours as desirable, exotic or breeder bred two rough coated Griffs together. She rare. knew the sire had a smooth parent which meant he was carrying the recessive smooth gene. In 6 generations on the bitches pedigree there was no smooth coat and therefore assumed she didn't carry the smooth gene. When the pups were born there were 2 smooths out of 3. So the bitch was carrying a recessive that was passed along for at least 7 generations unseen and finally popped up under the right circumstances. The same can be true of blue silk dogs. You can breed along for many generations assuming you have locked in the colour and texture, until one day out pops a black soft coated puppy. Resources: The recessives were there hiding within those two parents and finally came together. Cher Hildebrand 7