● "Reputable Dog Breeders? Is there such a thing? The reason I state that is that they are STILL breeding dogs so the dogs have puppies."
If you weren't so busy HIDING behind the cowardly bowler-hatted blue-faced [Anonymous] you might learn how to plan & punctuate your sentences. And to learn that Y!A requires you to end that first field with your MAIN question.
So your last sentence doesn't belong in that first field, and your real question needs to be reworded as:
● "Is there such a thing as a reputable dog breeder?"
● "Are there such things as reputable dog breeders?"
To which I can support [Lorraine]'s, [Anna]'s, [Amos]'s, [Nekkid]'s and [Jojo]'s responses.
I'm sad that your awareness doesn't realise that yet, and hasn't thought about the REALITIES!
For starters, you haven't defined WHO the "they" are in your:
◊ "The reason I state that is that they are STILL breeding dogs so the dogs have puppies."
😇1: If your "they" means "responsible breeders", of COURSE they do! Please wake up & realise that MANY people need calm, confident, physically sound pooches with the endurance, instincts, scenting-ability, self-control, temperament & trainability to perform as aide dogs, drugs-&-explosives detection dogs, guide dogs, herding dogs, retrieving dogs, search-&-rescue dogs, security & "police" dogs, sled-hauling dogs, therapy dogs, tracking dogs - and a few other FUNCTIONS.
Now SURELY you aren't NAIVE enough to believe that those IMPORTANT dogs are going to be available from con-artists, ignorant back-yard "breeders", the city Pound, dog rescue charities such as the Battersea Pets Home or HSUS or SPCA, or pet-litters, are you? (Although a blind pen-friend in Texas DID get her 5th guide dog from a rescue ranch. She'd had to return 4 professionally(?)-trained guide dogs in a row - 2 for health problems, 2 for cheerfully walking her in front of moving vehicles. So she had a sighted friend drive her to the rescue organisations that had GSDs, went home and thought, came back again to a young bỉtch who had been abandoned for getting pregnant at her first "heat" <the litter had already been found homes by the rescue organisation>, re-tested her, then took her home and trained "Ellie" herself, with assistance from the sighted friend for the "traffic" section.)
😝2: If your "they" means "irresponsible breeders", the sad fact is that USA legislators are NOT willing to create the laws and produce the funds needed to ENFORCE the laws that would prevent anyone who hasn't proved him/her-self and their household & property SUITABLE to obtain what I'll term a "Dog Breeder's Licence", without which no-one is allowed to own a fertile pooch.
Nothing that those of us outside the USA can do about that.
● "Millions of dogs in the US are put down every year. That does NOT seem like reputable or moral to me."
The ASPCA disagrees with your "number". It estimates that each year, approximately 1.5 million shelter ANIMALS are euthanased (670,000 dogs, 860,000 cats). The total euthanased annually has declined from approximately 2.6 million in 2011.
As the USA's human population is close to 329 million, that probably means 82 million families. Which means that there are likely to be up to 122 dogless homes available for each "shelter" pooch this year - IF every one of the 670,000 dogs is SUITABLE for re-homing. And IF every family in the USA has a suitable family & home for a dog - which not many do, when you consider the SENSIBLE requirements before a person is allowed a dog! Which TRULY responsible breeders DO!
Les the aged Kiwi - first pup in 1950; GSD breeder & trainer as of 1968