My two large GSDs do not wear any collar in the house or in my fenced yard. I do not want them getting caught on anything. However, when we go out for our daily walks, Killian (male, 110lbs) wears a choke collar. It works well. He doesn't pull on it at all. My 95lb. female wears a prong collar. She is VERY muscular and strong. If we encounter a loose dog, I must be able to control her. This rarely happens, so the prong collar does not affect her most of the time. I walk both dogs together. I weigh 100 lbs. As others have said, a choke collar or prong collar can be useful when used correctly. I was taught how to use them at obedience classes also.