I really appreciate all this advise, Do the park post rules??? maybe I need to go alone first and see what all the rules are maybe go with my son and see what goes on.
Now Charlie is not the submissive type he believes he is a yorkie in a sheperds body

and he is neutered so that should not be an issue. I had to chuckle at the post above whos dog started humping another. I too would have been mortified and I would have had to leave right away
Maybe when I take Charlie for the first time he could go with my sons dog so he can have a familiar friend, is this a good idea???
I also like the suggestion to put a bright colors harness on Charlie, he has never worn a harness but he does have brightly colored clothing.
Are there certain breeds that I should be concered would be aggressive towards yorkies?? I had never though that.
I hope people keep posting to this it is really helpful