this could go both ways. It is a matter of the breed if there is poor bloodlines. If there are good bloodlines then yes it CAN be a good dog in teh right hands.

I owned 2 rotties both of whim were adopted from shelters. They were good dogs and I trusted them 90% of the time. Since I didnt know their bloodlines I could not trust them 100% they were very good dogs. And for them to have been adopted out by the shelters proves they were good dogs. Shelters around here will not adopt out any breed of dog if any type of aggression has been showed.