Abused Train How To Train An Abused Puppy?

How to train an abused puppy? - abused train

A month ago we found this dog on the gravel next to our house. Only a few months and was also beaten or abused, and that the reason for his and backlegs went wrong. It is very sensitive and nervous, and bark in one of the boys in the house and even my mom sometimes. Is there a way to be trained to withstand without traumatizing him? Other suggestions and advice from puppy training?