Dog park has something of the MVD about it.
A few days ago there were only two people there in our giant park, separated by a fence. Girl nearest me keeps suspiciously looking over at the other lady, who's under the shade. Jupiter and I come in and start playing fetch. Walking the perimeter as we usually do, the two dogs bark viciously at Jupiter, guarding the entire south park area from us. I think "it's not worth it," and stay in the north area.
A few days before that, we were there and this lady's dog, looked a bit like a Shelty, came out of nowhere to bite Jupiter's leg. He kind of shrugged it off. Later the ball landed near the dog and it and its brother gang up on Jupiter, attacking him and biting him, apparently not noticing that he's over 70 lbs now. I kind of gave the owners a "really?" look and just moved to a different area. Luckily, she left after that.
Two owners bringing their aggressive dogs to the dog park in just a week. Makes you wonder.
Jupiter seems to have really settled down, and interacts peaceably with all dogs, with the exception of sometimes nipping a bit at the ones who want to be chased. He is pretty neutral to both dogs and people and mostly just wants to chase the dang ball for miles. I rarely hit him with my Chuckit stick, and I doubt that tough little beast would feel it even if I did.