He didn't say at a "dog run". And I have found "dog people" need straightening out. He also didn't say he threatened people. Dog owners have no concept of anyone but themselves. Dogs are still animals and as a runner I don't like being suddenly faced with a pit bull nipping at my legs while their ahole owner, keeps saying "aw he doesn't bite".
Having my kid and myself both chased by pit bulls in last 6 months I carry mace everywhere now (on runs). For the dog, and if need be...
Good for you OP. Good for you. I love it.