GSD avoidant at the dog park
My 8 yo female GSD which I adopted about 3 weeks ago has been to the dog park a total of 3 times so far. The first time when I let her off the leash she ran straight to the entrance and wanted out. The 2nd time she wanted to bolt for the entrance and tried to get out of her collar. This 3rd time, she was a bit better off the leash but has no interest in other dogs. She whines pretty much the whole time and when other dogs come near her she bristles her back and neck fur and runs back to us. She isn't aggressive, just has no interest in playing with the other dogs. Could this be because she wasn't socialized as a puppy or simply because she is an older dog? I am curious if she will learn to be more social over time.
thanks for the input