Hi Terri...uffda (that would be a northern mn scandanavian word lol) you have a lot on your plate...I was reading this when you first posted but loops was driving andmy response would have been too long to type w one hand!
I think you have been given good advice...I was going to suggest that it could be a dominance thing too. Shelby and Mandie seem to have their place on the totem pole but then adding Gilbert to the mix jumbles it some. I have heard that some things you can do is separate feeds, feeding dominate dog first...when you come home greet the dominate dog first etc...but I've never had to deal with this...my husky is such a sweet girl in the group that she has no problem being low girl on the pole. I do notice Ruby trying to hump Rosie every now n then and I stop it right away...a couple times I wasn't able too and Rosie took care of it quickly...I think her "evil smile" scares Ruby cuz when it comes out Ruby backs down pretty darn quick...good luck I hope it gets solved soon....oh yea...and I don't know if I would give M n S free reign of the house right now if you aren't there to supervise...I would worry if Shelby pinned Mandie again.