We are lucky to have an unofficial dog park close by that is visited by a group of regular neighborhood dogs and usually has a pretty small crowd. I've started taking Oona here once or twice a week for a run and play off leash. The owners mostly know each other and each others' dogs - I meet one or two new ones each time I go but it's mostly regulars. She plays well with the other dogs for the most part but she has started to become obnoxious with dogs who want to ignore her and/or chase a ball. She chases them and barks and nips at them trying to get them to pay attention to her. This started with one of her playdate friends, who has become ball-obsessed and now gives poor Oona the cold shoulder. Last week it was mostly Oona chasing while barking and nipping at this dog, and I got her and gave her a time out a few times when it was getting super out of control (O not listening to me at all, etc). Today she did the chasing and barking routine with two stranger dogs, and while their owners were ok with it and assured me that their dogs were patient, I'm concerned that the behavior is getting reinforced beyond just her one friend. She did play very nicely with other dogs when they wanted to wrestle and chase, without barking or harassment. It's the ball-chasing dog that she loses her mind over. Most of the owners are like "let them work it out" and I believe that can be a good route to go, and I pretty much do trust that these dogs will communicate when they've had enough without hurting her, but they've all been so patient so far that she's having a great time and it's getting worse. I'm also embarrassed to have the obnoxious barking dog at the park. What do my poodle people think I can do to help her break this habit? What is the line between giving her the opportunity to learn how to behave from other dogs and being overly permissive? She is about 5.5 months.