Recently, I was chatting in the classroom with a few of our more experienced students. They mentioned encountering the following scenario quite often while exercising their dogs at a local park:
Individual is walking dog on leash. Dog sees other dog, barks, leash goes tight. Owner pulls dog back on leash, saying, "Be nice! Be nice!" and fumbling with a tight leash until the distraction has passed.
Sounds like a recipe for reactivity, right?