Better bet is getting all the puppies microchipped so if they do end up in a shelter you get notified. Only 1 in 4 dogs end up in it's first home, too many people move or have a baby or just plain don't think a dog matters that much, they'll just get another. I'm sure whoever bred my dogs thought their buyers were great owners too. One got rehomed on Craigslist due to a move and the other ended up in a kill shelter with no one to claim him.
In the past 4 months I've fostered 3 mixed breed puppies, one the local vet even recognized because the buyers had brought her in several times, didn't care enough to come pick her up at the pound though. I just don't see the point in breeding more pet quality dogs and mutts, 4 million dogs put down every year isn't enough? Not like anyone that wanted a mutt couldn't find one without you adding to it.