A while back, I felt that dog parks were "good" for dogs. It took some educating, and convincing, but in the end it was the right choice.
It's not the always the dogs, it's the people that own them.
When I joined here 5 months ago, I didn't know too much about "signals", and "warning signs" to look for. I thought If a dog wagged it's tail, it was happy.
I watched a GSD walk over to a Lab, with it's tail raised, hacks up, head high, and eye whites exposed. I said to myself "uh-oh". The owners were about 10 feet away from the fence saying "look, they want to meet each other"..
Within a NY second, that GSD was all over that lab like a rag doll. The owner just walked over and calmly asked the dog to stop. The guy was saying: "come on buster, cut it out". Believe me, they were going at it. It was scary looking.
Finally, the owner of the lab pulled the GSD off, and left with his Lab.
I've learned so much from here, and also from the obedience schooling, that I now recognize some of these potential problems.
Since I've stopped going, I find Kira's focus so much better. She doesn't get too excited when she sees a dog anymore. She figures, why bother, it's not like she's gonna play.