Hi. The fact that you're an experienced dog person would have made me express things very differently if you had posed the question.
My family has had Yorkies for well over 40 years and purebred dogs for well over 100 - and they have known and been close to show breeders for all that time. They've also bred dogs (White Standard poodles in the teens to the thirites) and shown dogs (German Shepherds in the fifties and Mini black poodles in the sixties).
My first job in the 1970s as a young teen was helping a Yorkie breeder grow coat on her dogs. (Grooming, wrapping, bathing, etc...)
Now let me flesh out my thoughts to someone like yourself who is probably is interested enough in the topic to be willing to read a long post.
Yorkies are now very, very popular and are available EVERYWHERE. Their popularity should allow puppy buyers a lot of choice.
Of course my assumption is that someone seeking a puppy SHOULD be looking out for their OWN interests, not the interest of the BREEDER.
What they should (and probably do) always want is a healthy, sane pet.
Other considerations like breed, subtle conformational differences, etc... SHOULD be left up to their personal preferences.
Unfortunately, what most puppy buyers DON'T know,
(but we do)
is that the world of puppy buying is like a field FILLED with dangerous land mines - step on one at your own peril!
What are some of these land mines? Being an insider, I like to "flip" the standard thiinking process of the dog world on it's end & warn novice pet seekers of the dangers
- as I see them -
and try to steer them down the path that will allow them maximise their chances of getting what they want - and to maximise their chances of NOT PAYING FOR -IN MONEY OR HUMILIATION - WHAT THEY HAVE NO INTEREST IN.
Now for the meat and potatoes of my post:
Choice of sources for puppies
1- SHOW BREEDERS (that means any breeder who labels themself "ethical" AND belongs to a breed club and is on one of those referral lists AND shows in conformation.
Advantages:
A) The puppies from these breeders will most likely LOOK like what one sees in picture books
B) Generally - but not always - the parents of this dogs are well taken care of and fed quality food. This doesn't have as great an effect on the quality of your puppy as these breeders will insist, but it's certainly a nice thing.
C) A few of these breeders will be interested in low coefficients of inbreeding (COI). This is a very good thing -but it's rare even among show breeders.
D) Generally - the parents of these puppies will be health screened for 2-5 genetically transmitted diseases.
Disavantages:
A) Generally - the parents of these puppies will be health screened for 2-5 of the 100s of genetically transmitted health problems.
YES - read that sentence again.
Yorkies are plagued by many many health issues.
Only a few are things that can be screened for.
Eyes, hearts...whatever. Even if the list is a dozen - it's a drop in the bucket compared to the gadzillions of problems lurking in the DNA of all dogs.
REST ASSURED THAT HEALTH SCREENING IS NOT THE GUARANTEE THAT ALMOST ALL DOG LOVERS WILL SAY IT IS.
Homozygosity of alleles - is the real culprit in the likelihood that any particular puppy will express a disease that is the result of a negative recessive gene. Low coefficiency of inbreeding is more important when you're talking about the health of an entire population of dogs. People who believe health screening and genetic testing is the answer to health problems in dogs DON'T UNDERSTAND POPULATION GENETICS. I'ts shocking how people who don't understand risk assessment, population and health issues simply repeat stuff they hear and take it to be truth.
So - while health testing is nice-
IT'S NOT WORTH THE HYPE.
B) These breeders are SUPER CONTROL FREAKS. They have been trained over the course of the last 30 years to be facistic in their desire to control others. As a rule, they actually believe it is appropriate to decide which philosophies are allowed, what thoughts are allowed, what practices are allowed, what housing methods are allowed, what status of genitals are allowed etc.... I need hardly expand on the fact that some other people - especially those steeped in the AMERICAN EXPERIENCE OF FREEDOM & LIBERTY object to being TOLD what may and may not be done with a pet - and will find this process highly objectionable. I agree with them. If I dign't have family and close friends who showed dogs I WOULD NEVER GO TO ONE FOR A PUPPY. As it is, family and friends can't pull that crap with me.
If one wants to break into the world of dog shows, you have no choice. Physical MINUTAE is so important in dog shows that you MUST have a puppy from champions to have hopes of finishing one yourself.
C) These puppies tend to be VERY expensive. Someone has to pay for all those dog shows, dog handlers, health tests, hair ribbons, hairspray, hair wraps, cages (crates), whatever. Well over $1000.00 bucks at a minimum for a pet on limited registration. (That means: not good enough to breed).
CONTRARY to what some people think - price can be a justified consideration when purchasing something. If money wasn't an issure to these breeders they'd give the cash to a charity. They don't .
D) Most often you have to go on a waiting list and commit to a puppy before they're even born. To some this might not be a problem but to people old enough to remember the JOY of selecting a pup YOURSELF from a litter on the ground....
E) These breeders insist they know better than you and will not allow you to pick a puppy. They'll pick one for you. (Meanig they'll force you to take the least desirable puppy they have at the moment).
2- BACKYARD BREEDERS
Advantages:
A) Generally these people will be NICE to those looking to buy a puppy. Some people LIKE TO BE TREATED RESPECTFULLY.
B) Generally these people will be HONEST about wanting the best buck for the dog being sold and will explain why the tiny females cost more money. (Those are the ones everyone wants - ie supply & demand)
C) Generally, you'll be able to see BOTH parents and the puppies in an environment just like yours - a pet home. Usually the dogs are bred because the people LOVE their pet and want puppies around.
D) Often, but certainly not always, you'll be able to buy puppies at very reasonable prices.
E) What could be better than a male and a female dog that live together in a STABLE relationship having puppies? I like the idea of a puppy from parents that knew and cared about each other. Others might poo poo this idea, but I don't. And I'm not usually a sentimental fellow.
Disadvantages:
A) Generally these dogs would NOT be competitive in a show ring and there will be much more variation in the physical qualtities of the puppies. If a person has an intense desire for particular physical traits they'd be less likely to find what they want IF what they want is a look -valued by the breed standard. For instance, with Yorkies, backyard breeders are much more likely to produce oversized, long faced, long backed, drop eared dogs with incorrect color distribution on the adult coat.
B) Generally these people DON'T test for anything. All they go by is the fact that the parents are healthy. Therefore: You will take a risk that the puppies are more likely to have a problem with the 2-5 things that breeders test for. This is a risk people have taken for a thousand years. I don't think it's such a bad thing. Especially since screening only makes it less likely that the dog will not have those exact problems.
So - if you could have had 3 screens, your risk is only greater on those three potentialities.
C) Generally these folks aren't erudite about obscure dog things. Some puppy seekers WANT to feel their breeder is SUPER knowledgable about dog stuff.
D) Often, but certainly not always, these breeders will want very high prices for their puppies. These is easily avoided by saying NO to those puppies. There is no reason to pay top dollar for a backyard breeder puppy of a popular breed.
E) Some backyard breeders have too many dogs & are really puppy merchants. I'd say if a person has more than 2 females and one male - they're more likely a puppy merchant than a backyard breeder.
PET STORES,
PUPPY MERCHANTS,
INTERNET PUPPY SITES.
Advantages:
A) None really. While it's fun to look at puppies on the internet - but nothing else is good about them.
Disadvantages:
Too many to mention. I'd never recommend any of these breeders.
Please note that the best place to get puppies is NOT a black and white issue.
It's NOT as if "SHOW BREEDERS WHO TEST" are the good guys and ALL OTHERS are the bad guys.
Of course, show breeders will generally like everyone to feel that way. What's silly and shameful is that so many people buy their hype hook , line and sinker.
Moral 1:
Don't believe the hype given by breeders themselves.
SELF PRAISE IS SCANT RECOMMENDATION.
Moral 2
When it comes to claims about "breeding for health" -BE SKEPTICAL (like a scientist) and believe only what is PROVEN by empircal evidence that can be repeated in objective experiments.