My 60 pound German Shepard dog has a bad habit of barking at people or other animals he sees passing by. He is a house dog at night but spends most of daytime outdoors in our 1 acre fenced in yard. I was wondering if anybody has had any experience with bark deterent collars. I don't like the shock collars, but am considering either a sonic collar or citronella spray collar. Which is the most effective?

