Breeding more dogs as pets when there is such an overpopulation of them is, in itself, a mistake. How do you think overpopulation happens?
Perhaps dog breeders should be forced to visit the animal crematoriums a few times a week so they can see all the dogs and cats which are killed and burned so that the breeder can make some more money selling a unhealthy 'purebred'. But by all means, continue defending the silly business model while I enjoy rehabilitating rescue animals and finding them good homes.
Maybe for puppy mill owners, but many dog breeders don't do it to make money. They do it because they like the breed.
If you actually, genuinely like dogs, why would you breed ones that are drastically more likely than others to have health problems, and why would you want to enable the abandonment and eventual death of many of them by contributing to their overpopulation?
I suppose the bottom line is, the tossing around 'all breeders are bastards' and the resulting discussion is incredibly offensive. Now if we want to actually give this person advice on the puppy let's do that, otherwise stop the derogatory derailments.
Here's the thing: You're saying a lot there, but you haven't actually addressed any of the legitimate concerns I've raised. So please, stop pretending that I'm calling you "evil" and, if you want to challenge people's points, actually challenge them.
You did specifically mention health and genetics, though. First off, purebred dogs, especially show breeds, tend to have fairly specific health problems because their bodies have been bred to various extremes which are not themselves very functional, and because breeding in a low-diversity gene pool is in itself problematic. These problems do not exist as much in mixed-breed dogs, and there are many health problems which mostly affect, and are linked to, specific breeds. Yes, mutts can still be unhealthy, but not generally as often as with purebreds, and the fact remains that many harmful genetic conditions are
the direct result of dog breeding, some of them done
intentionally because people liked the way it looked or because it helped them adhere to some kennel club standard.
I have no idea what's up with your probability-breakdown there, but in reality, an offspring of two organisms with more dissimilar genetics (e.g. a mixed-breed dog) is usually better off with less a chance of genetic disorders than an offspring of two organisms with very similar genetics (e.g. a purebred dog). Consider this effect over the course of many, many generations of the same breed of dog, especially considering the effects of close inbreeding (not that all breeders do this, but it does affect the genetics of the breed).
So... yeah. I'm not calling people "evil" or "bastards". I'm saying I disagree with what they do, and consider it wrong, and am giving reasons why.