Never could understand the yelling/screaming at bird dogs. seems to be popular though.....
I am used to working with various breeds of herding dogs, I don't know if the work they are bred for makes the difference or not ( they are basically meant to "hunt" pretty close and in conjunction with your efforts and not 'freelance') but I've worked with some big, 'hard' dogs, and they didn't require me to raise my voice.
Also FWIW, studies indicate the thing in a given word or command that a dog pays the most attention to, is the first syllable. Kinda like the old Gary Larson Cartoon. I could call my dog Rommel by saying " Herr Field Marshall Erwin Rommel" and all he would basically hear is "Rom"...
