The upside of a market where every acquisition involves a conversation is that you get to ask questions. Three are worth asking every time. Have the puppies' eyes been examined by a veterinary ophthalmologist, which is standard practice in this breed at a few weeks old and produces a written result. What are the parents' MDR1 genotypes, given that two clear parents cannot produce an affected puppy and the test has been available for years. And is there any history of Dermatomyositis in the line, which is the question a careful breeder will answer straightforwardly and an evasive one will talk around.
California gives buyers more statutory protection than most states through its pet dealer warranty provisions, which set out disclosure obligations and remedies where a dog is found to have particular illnesses or congenital conditions shortly after sale. It is not a substitute for asking the questions, but it is worth knowing the framework exists rather than discovering it afterwards.
Rescue deserves equal weight rather than being treated as the fallback. Breed-specific Sheltie rescue operates across northern California, adult dogs come with real history attached, and the wait is often no longer than a good breeder's list. What matters either way is not paying a premium for speed, because in a market with no retail option the only thing speed buys you is a dog somebody was willing to sell in a hurry.