I agree with every Nancy has just said. I differ with her in only one aspect...I do like dog parks. I enjoy doing some socializing there and for the most part my experience has been a good one but I might just be lucky. There are people there whom I don't like and there are dogs there I don't like and we either leave when those people or dogs come in or we just walk right past the park if they are already in there.
As Nancy said, Eskies play very rough and are very vocal which can often give the impression of them not playing nice. People are often very shocked when mine are playing and wrestling because they look and sound like they are killing each other...it is an extremely rare case that I have to step in and separate Nala and Quinn. They also LOVE LOVE LOVE to play chase...with each other and with other dogs. Quinn tries often to engage other dogs in this game so she will bark at them and chase them because she wants them to chase her. It is totally innocent and I don't step in because she will eventually back off if the other dog isn't interested and in the rare case she doesn't then I step in.
I would like to point out that there are differences in growls and barks. You have to remember that this is one way they communicate...not all growling is bad and neither is all barking. Nala always growls at me but it is the tone of the growl and her body language that tell me she is playing or trying to tell me something (like, HEY, I want some attention mom!). I don't worry about her growling at me because A.) I know in what context she's doing it, and B.) I am the boss and she recognizes that and doesn't challenge me on it.
My advice would be to sit back and observe the situation. You will start to notice the difference between good and bad barking and good and bad growling...it is all about tone and body language. For example, high pitched barking usually means they are saying hello, like when you come home, or during playtime, so it's good, and in some cases it can mean they are nervous which is bad but you will see a distinct difference in body language between these two scenarios. Bad signs to look for are stiff tail, tail between legs, baring teeth with lips drawn back and tense(baring some teeth during play is normal), snarling (totally different than growling), ears back or pricked forward, and narrowed eyes...in fact eyes can be the best indicator. Here's a pretty good website on body language...
http://www.pawsacrossamerica.com/interpret.htmlLastly, there is no parallel to having their behavior controlled on command...like Nancy said, "No growl, too bad, be gentle, no bite, etc."