I have a neutered male gsp and an intact male Britt, as well as an intact female gsp. The male Britt is a good heat thermometer, but we don't really have a problem with the two. (Both kennel dogs.) I also have a neutered male gsp. He was pretty laid back even as a youngster, but at the time I had 3 intact females around (including his dam), and it seemed easier to fix him than fix them. The only time he's not laid back is when it's time to hunt. Then he becomes very, very eager.