Since bringing home Buster (Parsons Terrier/Boston Terrier) I have been vigilant with order and how things are run in the house. Dog crates are all over the place and everything is done with Xena first, Alfie next and then Buster. I can take all three to the park together and I have absolutely no problems. Buster is doing good with his basic obedience and pretty much stays out of Alfies space. He does have a problem with the submissive peeing thing, but I just clean it up and don't even mention it to him. He's as cute as he can be. Everybody loves him and when I take all three to the vets, tey all three behave beautifully.
**My question is: When Xena has a bone, toy, whatever, if Buster comes up, she will relinquish it without so much as a snarl, and of course he trots off chest out and head held high. When they are all three in line at the water bowl, Buster goes under them and makes it to the front and crowds and they just give him his way. While I am proud of my two big GSDs, I don't want them to get "jealous" of Buster and discipline him themselves. I am constantly getting on him when he steals bones, toys, whatever (this is where the submissive peeing comes in)and giving them back to the rightful owner. Sometimes I will put him in his cage to gnaw on his bone for awhile. The dogs are constantly watched by me and Buster is separated from Alf and Xena when they are fed.
Am I doing it right? From what I read, I am, but just to keep everyone safe, any other suggestions? I'm sure Buster will get it one day that he is not allowed to crowd or steal, but again he came to us untrained four months ago and he has done great. He and Xena wrestle ALL THE TIME! She will even fall on the ground and let him "attack" her. He thinks his "massive jaws" can crush he windpipe Ha!

Am I doing it right? Any ideas?

I think that ideally you won't give any of the dogs bones and toys while they are all 3 together. It sets up a situation where each dog has to be on guard to protect their resources. If the new dog is able to take resources away from another dog that could be an indication of how the pack order will be. You can't just base pack order on who got there first. And if Buster comes ahead of Xena in pack order then YES he can crowd her or steal things. If you try to establish a different pack order from what the dogs recognize than you will create a problem.

Well, but even though the dogs arrived in that order, that is their pack order. Alfie is 120 pounds and he backs off of Xena, but then Xena gives Buster leeway, and Buster barely weighs 20 pounds and has never growled at or challenged Xena.
How can a dog who barely weighs 20 pounds and has never growled at the other dogs be the pack leader? Sometimes I think he is going to implode he is so hyper. He runs around like an idiot most of the time. Believe me, their is no commanding presence about him. He's a 10 month old rat on acid. I just don't see how he could be the pack leader. I see him as a pushy teenager.
Yes I will cage Buster when I give them a toy or bone next time. I just have never ever had any problems with Alf and Xena together. From day one, they shared the same water bowl, both heads together in the water bowl with no growls, hackles or disruption. (we had them on leashes at the park for their first meeting, we turned around and they were both in the water bowl, my stomach dropped and we separated them). The only problem I have ever had with Alf and Xena is when he tries to mount her. When he does that she rips him a new one and he slinks off.

Well I just thought I had gone overboard with Alf and Xena, not letting them show any aggression towards the puppy, that Buster was fearless and gonna get himself in a bad spot one day.