I intended to have my dog, Steve fixed. One of the reasons is that he's a bit too protective/skitzy with men. To the point that it's not only an annoyance, but it's kind of a problem. Not to mention the fact that it's stressful for Steve. I figured that neutering would curb this behavior. But a friend recently told me that since he's a year and a half old (he'll be 2 in December), his hormones have "kicked in" and neutering at this point would make no difference. He went on to say that he'd had a fully adult dog fixed once and it changed his whole spirit/demeanor; that he'd wished he'd had his old dog back, and he insists I should leave Steve intact. I've found conflicting arguments on the internets. Anyone have any personal experience with it?