I have a Senior Citizen Shepherd/Collie cross. My mother has a manic, obsessive-complusive Jack Russell. Both dogs fear the lunge whip. For the first several months with chickens, the dogs weren't out off leash with the chickens. But, I figured that I'd be able to eventually trust my geezer with them, and never the Jack. After a while, I let the old man out loose while the chickens were out. I caught him stalking a chicken. He's pretty much deaf, but it didn't take more than a crack or two of the whip to get him off of his stalk. Now, the only time I see him alert to a chicken is if he sees them out in the woods. I don't think he recognizes them as chickens, just as something moving out in the woods. With his hearing deficiency, I can't just holler at him. I have to hoof it out there to get him. The Jack got harassed by the chickens while she was out on leash. For the most part, she seems to respect them. We'll let her out now while the chickens are out, but only under strict supervision. If the chickens get worked up and excited, it turns her on. She will back off with a crack of the lunge whip.