Considering adding another GSD
I have a 4 month old female (house trained, UTD on shots, will be spayed)... and a 9 month old male has come to my attention. He is neutered, house trained, UTD on shots, chipped, and good with kids. The only thing I'm worried about is the owner says he is nervous of other dogs because he was "jumped" when he was younger. She said he is fine off leash at the dog park, that he will just bark and then curl up into a ball if he gets scared. Is this a concern? Could this later turn to aggression? Any advice would be more than welcome/helpful!