Other dog owners *sigh* can be so, so frustrating.
My aim for Asha (as has been with every dog I (or my mother) have ever owned/fostered) is to be RESPECTFUL. Of both people and other dogs, the same thing you are trying to do with your pup. It's a good attitude to have.
I find myself disliking almost every other dog I meet. I've put this down to the dogs being rude (without even knowing that they are being rude, as their owners are blissfully unaware that they have created a monster)
I remembered why I don't go to leash-free parks yesterday. It was Asha's first (and LAST!) visit to my local dog park - 2 Owners let their dogs run after other dogs and hunt them crazily - Blocking them against benches and fences - Not ONCE did either dog get re-directed or controlled. Another small terrier was constantly trying to hump some of the female dogs and again, the owner (I didn't even know who his owner was) ignored it.
The couple of us who had young larger dogs (a great dane, shepherd and Asha - people who I'd never met before) left, as it's just not something you want your dog to experience.
What I find is that people who don't know how to control their dogs, just let the dog do whatever it likes - at the expense of your dogs enjoyment or training. They take them to a dog park "because it'll get rid of all their energy and they'll be a good doggy at home" but it's always at the expense of every other dog who is young, or well behaved.
I am aiming to have Asha as non-reactive as possible, to try and get her to a point where other dogs don't bother her as she has the tools to help her ignore the behaviour (or reprimand a rude dog in a small way, without launching at them - It's something I really really don't want her to do, as she's going to be a big girl - and we all know what happens when a big dog bites a little dog - it's the big dogs fault - even if for the previous 20 minutes the smaller dog has been a harassing little grub)
Some tips in this thread are already helpful :-)
Asha - 22/05/15 Wolfhound cross a Dogue De Bordeaux X American Bulldog.