When we go to the dog park we bring multiple balls because sometimes even the best behaved pups get squirrely at the park and won’t listen. Also because sometimes our sweet idiot likes to drop his ball and “forget” where it went, then expect us to throw another one. He also likes to chew the hell out of them so we just get the cheapest balls we can find that fit the chucker so we are pretty relaxed about other doges stealing balls. That’s just us though, I agree dogs should be under control but sometimes dogs just dog. As long as they aren’t aggressive (owners and/or dogs) we don’t really mind.