But it's the ethics that's involved. Can you, with good faith and heart, endorse the selling of pet store puppies?

Puppy millers are large backyard breeders. In my book, there's no difference between PM's and BYBs. The puppies didn't just come from "unreputable" breeders. They came from backyard breeders breeding for the almighty dollar. Canada may not have as bad of an overpopulation problem as we do, but the ethics remain the same. Did you see that video that of the armless Chihuahuas that Sheena's mom posted up in Dog General? That was due to backyard breeding. I despise any and all Petland stores no matter their euphemism for their actions. I believe we had one down here, but it was closed down after vehement action against its selling of puppies.