Find a shelter or kennel within walking distance
Visiting the facilities is the best way to make sure it is a safe and responsible place. PTherefore, if the breeder does not want to show you the facilities, it is better that you stay away from that hatchery. In addition, the breeder should be specialized in only a few breeds, giving him an appropriate space for the size and breed of the dogs.
On the other hand, if you are looking for a refuge that is close to home you can meet the puppies in person and decide better which one suits your lifestyle.