<human>: Can you summarize the given text in a few sentences?

I rescued Morty last week from a neglectful home. From what I've gathered, he spent the majority of his day in a kennel and was only socialized with his parents. When I first met him, he barked for about 5-10 minutes and didn't trust me, but eventually he warmed up to me and now he's incredibly friendly. He's also friendly with my roommate and his dog, but after introducing them slowly.  
  
I've taken him to Petsmart a couple times and I walk him on campus occasionally. His reactions to unfamiliar people and dogs are mixed. Generally, he'll seem very interested and try to pull towards them (we're also working on loose leash walking). If he does get close, he'll bark at them. What can we do to work on this?
<bot>: Dog wan't socialized at all and is only friendly with people/other dogs if they are introduced very slowly. What can I do to help him gain more trust/confidence in strange people and dogs?