1. its a completely commercial operation that offers at least SEVEN different breeds. No reputable breeder would EVER do this.
Breeding multiple breeds is a HUGE red flag for any breeder. Heck, even the BYBs (which I still would not get a dog from) usually stick to just one breed.
2. There is no reference to any clearances done on any of the parents. Responsible breeders always health test for genetic and hereditary conditions that can be passed on the the offspring. By clearances I do not mean "vet checks" or "clean bill of health" on the parents, or puppies for that matter. I am referring to OFA certified patellas and hips, CERF results for eyes, etc
Dachshunds are a relatively hardy little breed but they are susceptible to some serious diseases. Best to stack the odds in my favor by doing business with a breeder that knows the genes behind their lines.
3. No reference to any titles on any dog, no reference to participation in any breed club, and no reference to participation in any performance events. BYBs don't bother with this stuff and puppy mills certainly don't
4. CKC registered dogs. Unless they are talking about the Canadian Kennel Club (which I doubt since they are in North Carolina) the CONTINENTAL Kennel Club is a bogus registry used by puppy mills and BYBs. Basically anyone can go on there and register a dog.
While AKC is considered the reputable registry in the U.S., keep in mind that its just a registry. Just because a dog is AKC registered does not mean that the dog came from a reputable breeder. Many BYB dogs and puppy mills are AKC registered because the parents are AKC registered, thats all the AKC keeps track of.
5. Multiple litters on the ground. Lots of dogs that they couldn't sell from months ago being advertised as "available for adoption."
Thats a little offensive to the folks that are into rescue. In fact rescue dogs come from these exact situations (BYBs and Puppy Mills), they are the reasons that shelters are overcrowded and dogs get euthanized. A reputable breeder is responsible for their pups for life. They will step in and take the dog back if the owner is unable to care for it. This is typically a clause in their contracts. A BYB/puppy mill on the other hand, will dump the puppies at shelters. They don't keep track of their dogs and when their buyers rehome the dog or drop it off at the shelter because they are too busy/allergic or whatever excuse they come up with, a byb/puppy mill will not go back and get that dog.
So although a rescue and a puppy mill dog might have the same origins, the key difference is that when you adopt a rescue dog you did not support unethical and disreputable breeding practices, you did not enable a puppy mill to continue breeding the same dogs over and over and over again in unsanitary conditions, and you did not add to the pet overpopulation problem.