Which dog park? I used to take my furballs to the dog park at Palmer Park.
Usually most people will start getting huffy about it (if they actually care) around the time your pup is 6 months old or a fairly large dog. An unaltered puppy is okay but they dont want fights between males. You'd be amazed at how many people will bring their unaltered in heat females to the dog park hoping an intact male will get her.
The more people I meet and talk to,the more I love my dogs and their intelligence.
Zena GSD 6/1/03
Shasta GSD 5/5/10
"Dax" Thor z vom Weberhaus GSD 3/18/2013
Riley GSD/BC 1/10/05-2/1/2013