My wife's a vet. She does relief work at the pound across town.
I helped her catch/fix/release feral cats at two colleges we attended. I have had a wild cat hanging from my hand with its teeth embedded in my flesh. The purpose is to fix them, then release so they keep the population pressure on the other cats in the area, but without that unwanted side affect of making more.
My sister has 8 dogs, all saved. Most are street dogs.
We have 4 dogs, all saved. 2 from the pound, one from the boston terrier rescue group in dallas and one my sister's boyfriend found 14 years ago playing with a plastic bag in front of home depot. We also have 4 cats.
We do our part
If you want a specific breed, try looking for a rescue group in your area. We drove 4 hours to get out boston mix. We saw him on the web and we knew he was ours. Sure enough, our other 2 dogs agreed completely. We got the 4th one a couple of months ago. Those 2 are about the strangest dogs I have ever met. Hilarious senses of humor.
If you want to do your part, rescue from the pound or a group. Breeders are not regulated and run their bitches into the ground, often inbreeding in the process. See what the parents look like and how they are kept. If you see cages, walk away.
On the inbreeding, ever see a crazed dog that just can't sit still and usually snaps into fight or flight at any sudden movement or what normally would be acceptable behavior such as tummy rubbing? That's inbreeding. Sure it can come from abuse too, but if you see it enough you can pick the inbred dog from a group of abused dogs. I've seen it so many times that I can most likely do that. Abused dogs will cower or be wary. Inbred dogs will ignore you then suddenly walk up and bite your hand or leg and run away. Of course this is not a hard rule. It's just been my experience.
If you see a litter, don't get the dominant one unless you like a challenge. By challenge, I mean biter or one you have to actively dominate, depending on breed. The smallest will be passive and/or skiddish. You can train out both sides to a certain extent, but some part of that behavior will remain. Just food for thought.
Save a dog. Don't pay 400 bucks for one when you can have your best friend in the world for 40.