i've met dogs that it helped calm things down getting them fixed, and i've met dogs that it didn't change a thing, because they were softies to start with! sorry i can't help more on that, but what a butt head at the park! we had a similar experience last time we went when a guy had his dog off leash and it was running up our butt. people with "normal, non aggressive" dogs like a lot of people call them (labs, goldens, etc., not stereotyping but a lot of people think they can do no wrong because they're "normal pets" and not bullies etc) are sometimes very inconsiderate, and ignorant. BPO'ers are just special, i wish we all lived in one town!