Sebastian and Oliver don't fight due to overexcitement. Their triggers are more territorial. Most of the time, I believe, it's because they are trying to claim me but sometimes it can be just because one of the dogs is a spot in the house the other dog wants to be. It can also be a doorway or the top of the stairs.
Example #1: This just happened last night around 11. Mind you, Oliver still has the big ol' cone on his head. Sebastian happened to be laying in Remy's crate, Oliver was sleeping on the couch next to Tanner. I was going to bed so I told Tanner to either put Remy in his crate or take him to bed with him and he could leave Oliver on the couch and leave Sebastian either in Remy's crate or put him in his own. Tanner went to take a shower and the next thing I hear is barking. I come out into the living room and Oliver is inside Remy's crate fighting with Sebastian. Apparently, Oliver wanted to go lay down in the crate and wanted Sebastian out. I didn't see who started it.
Example #2: Oliver is laying on the couch next to me, one of the other dogs even comes close to the couch we're on and he starts growling. When that happens I can usually stop it right away by touching the side of his neck and saying no. If it excalates to the point of actual fighting, then they get off the couch and on the floor.
Example #3: When the dogs are outside all together, of course, they don't always come in at the same time. Yesterday, Oliver was the last one to come in (the cone slows him down) and he was trying to come in the slider and Sebastian was standing right there blocking the way. They do the stand and freeze and I get Sebastian to move back away from the door.
These are just a few but you get the idea. All their fights seem to be over a piece of real estate.
Any suggestions for this type of behavior. Hopefully, now that they've both been neutered once the testosterone levels in their bodies level off they will go back to being less territorial. Remy will occassionally get caught up when the fights start but his is more excitement I think.