So this is becoming something that happens often. Without looking at this and ONLY hearing it, it sounds bad. Lots of roaring and even some yelping. There have never been any injuries. Malone will challenge Nigredo. Teeth bared and hackles raised. Malone does not submit quickly. He WAS initially trying to mount/hump Nigredo but Nigredo is having NONE of that and violently threw him off and pinned him down and Malone hasn't tried that for a while. Nigredo has to repeatedly throw him down and pin him to get him to leave him alone. He gets back up for a while and then usually he stays down but sometimes he KEEPS getting back up. Nigredo sometimes begins to lose his patience. He will stop battling Malone and stand with his head low and growl a certain way while Malone is still jumping at him and harassing him. I always intervene at that point and remove Malone. Malone either does not detect the potential danger or does not fear it. Nigredo has never shown aggression towards another animal, but they say the quiet and peaceful ones are the most dangerous when pushed too far. That stance to me means "I HAVE HAD ENOUGH AND I AM GETTING ANGRY". He is a dog and as thus is not totally predictable and if he truly snaps, Malone will get hurt and there may not be anything I can do. Nigredo is 100 lbs and ridiculously STRONG when he wants to be. This stopped without me intervening but I HAVE felt the need to get involved from time to time despite being told it is best to let them work this out. They are not left together EVER when I am not here. Malone is always crated when I am not home. If I shout at them, they will stop momentarily but often resume in a moment. If I get/stand up and am very stern, they will break it up and move along. Malone is nearly 7 months old and not neutered yet and he is bad and I understand that this behavior of testing Nigredo is SOMEWHAT normal for his age and whatnot, but it isn't getting any better. The day Nigredo finally loses his patience is a day I NEVER want to exist.