That doesn't sound like most pounds I know about. It's very unprofessional. Some pounds only keep animals 3 days, but most people at shelters know very well that a lot of people get rid of dogs for all kinds of stupid reasons that have nothing to do with the animals.
For example, I was visiting the local no-kill shelter and a beautiful Siamese cat of about 6 months old was brought back because it "meowed." Turns out the people had taken it home and dumped it in the back yard with no effort to befriend it or feed it or anything. Then when it meowed because it was hungry and scared, it was a "bad" cat and they took it back to the pound. Stupid asses like this are everywhere. The only reason they were allowed to adopt it in the first place was because a new volunteer didn't do the proper checks.