Both our dogs were pound rescues. The first was pulled out of a home by animal control after his mother was beat to death by the original owner. He was terrified of people and looked like he needed a loving home. It took six months to get him over his fear of us.
Our other dog was dumped at the pound by his original owners. They bought him when he was a little puppy. But, when he became a full grown dog, they dumped him at the pound. Seems many people want cute puppy dogs. They just never envision the puppy growing up. Animal shelters are full of puppies that committed the sin of growing up.
If would like to speak further, you can reach me at firstname.lastname@example.org