About a month ago we found this little puppy on the gravel road beside our house. He was only a couple of months old and was either abused or hit and that caused his backlegs to drag and function unproperly. He's very sensitive and jumpy and will bark at any of the males in the house and even my mom sometimes. Is there anyway that I can train him not to do that without traumatizing him? Any other hints or tips of training puppys?