I don't really have a lot of confidence in AKC's dna system. It is my understanding that a frequently used sire will be dna'ed but dams rarely get dna'ed unless AKC does a home visit. When AKC does a home visit, if there are any litters on the ground where the sire and dam are present, the AKC inspector has the option of doing dna on both parents and all the pups in their litter. All that dna proves is that those pups were produced out of those parents. Often, many of the dogs behind them are never dna'ed. Frequently used sires are dna'ed but not the dams.
What bothers me is that AKC has something called conditional registration which means that if, through a routine dna check of a dog, it is discovered that the dna is incorrect on that dog and can't be proven for 3 generations then they will issue a conditional registration to any of the offspring of the parents that are in question. If the dogs with questionable registration are bred and their pups are eventually bred those pups will be given a conditional registration, if those pups are bred they are then given full AKC registration because they have 3 generations of supposedly correct breeding. A person would have no way of knowing if another breed had been mixed in 4 generations back.
I guess my point is that it would be real easy for a breeder to sneak in a maltese or s**tz tzu and if they avoid the dna testing for a generation or so then they will get away with mixing in another breed with the yorkies. I feel strongly that this has been done, possible by just a handful of breeders, but once those pups get into hands of other breeders then the damage is done, the genes are set. I feel that is why we are seeing so many parti pups now. It's just a gut feeling and I know many won't agree with me. I know that are many passionate parti breeders that love their parti yorkies and they try hard to produce nice healthy pups but when it comes to showing it is a disqualifying fault and they should respect the YTCA's concern that many of these dogs might not be pure yorkie and they should not be shown.
American Kennel Club - Conditional Registration