[matese]

You only have him several weeks, with dogs that have come from abusive environments it takes longer for them to feel safe in a new and strange home, to bond and feel safe with you. Like Lovetodream88 has stated, he's probably not use to any or much human contact. Be patient with him, give him lots of TLC, and yes, working with and training him commands and tricks with much praise and treats when he does what he's supposed to do will help in the bonding. Nice walks also helps. It will take time. You didn't say how old this pup is. The older the dog,the longer he was kept in this situation and the long it will take for him to trust and bond.