It is hard to tell since so many breeders are breeding carelessly with no regard to the breed standard. I think the puppy is very cute but all yorkie or to breed standard -- ?????? Probably not. This is the sort of thing that happens when breeders decide the out-of-standard traits their dogs exhibit are "okay" and not a problem to a breeding program. "Too big, oh well. Coat not quite to standard in color, texture, or straightness, it will slide. Large ears, large nose -- maybe the pups will be smaller? Let's take a chance, cause we gotta make our money back, right?"
Get a few of those "out-of-standard traits" in the same pup and it is hard to tell if they are pure bred or not.
When you buy a dog that is not registered you are really taking your chances. If the mother was really a pure bred yorkie, wouldn't the breeder have regitered her and registered the puppies? There must have been some problem. Still, I understand about looking at a sweet little pup and bringing them home regardless. Love doesn't have a breed standard.
This is why it is so important to pick your breeder BEFORE you look at their pups. Make sure you are finding one who is ethical and not a greeder.
The problem that has really multiplied since yorkies have become so popular is that unscrupulous breeders have tried to jump on the wagon to fill their pocketbooks with no regard to bettering the breed or even meeting basic breed standards. This dam obviously should not be bred. She is far from the yorkie standard and I doubt that she is purebred. But since so many have continued to breed OUT OF STANDARD, she may be
pure-but-poorly bred. This is the sort of thing that happens when we throw the standards out the window and undo the work of countless breeders who meticulously evaluated their dogs and bred only the very best examples of the breed to continue to improve lines and hopefully ensure litters of the future were as close to standard as possible. These unethical breeders of today are diluting the gene pool until we start finding all of these threads where members are questioning the parentage of their puppies.
All you can do at this stage is help the problem by becoming an outspoken proponent of healthy breeding to breed standard, try to stop the breeding of unregistered dogs, and by all means NEUTER your Romeo to stop the spread of out-of-standard pups.
Pls do not worry -- Romeo will probably be a WONDERFUL pet. He may be a lot larger, may not even look completely yorkie but I bet you will love him just as much! I think the yorkie personality shines through most of the time! I still miss my first little yorkie Maggie -- an out-of-standard pup that I spayed as soon as I determined she should not be bred. She was still the sweetest and most loving dog possible -- worth as much in my heart as any show dog! But, I did not want to contribute to the problem of out-of-standard dogs. I still wanted a yorkie that looked all yorkie and I have two of them now from a breeder that refuses to just mate any two dogs to make money. I love all the pups equally but I don't like all the breeding practices equally!