Aggression or Anxiety?

[LDB158]

Hey guys! I have a couple of issues I was hoping someone could help me solve. I am posting one of these here, because I'm not exactly sure if it is agression or anxiety or jealousy. I will give the background of all my dogs. I am probably going to post another topic in the dog agression forum about my other issues that actually deal with agression, I believe one of my dog's is fear related and the other is dominance related.

Here is the background of my pack-

Speedy was my first GSD that I have gotten and he just has an amazing temperament. He is 8 years old and I rescued him about 6 years ago. I figured that he was just an awesome guy so I wanted to get him a buddy, so I got Sadie, another shepherd, 3 years old, 2 years ago. I just got Bear, a chocolate lab 2 years old, a month ago. It has been an extremely long month of trying to get the three of them to accept one another. Sadie is extremely territorial and I brought Bear into our house abruptly, because the prior owner was about to shoot him. I told myself I would never get another dog without introducing them outside the house, but I just couldn't let him die and nobody else was willing to take him in. I picked him up from the owner when I got off work at 11 that night and brought him home. I didn't introduce them that night, but waited until the next day. My mom came over and we walked them all together and brought them back in the house. They did a really good job, and we continued to do that. I put up a 4 ft baby gate in my house and kept him separate from them and would reward them everytime they approached the gate and sniffed one another. Whenever I did bring him in the living room, I would tether him to the sofa and have Sadie and Speedy on leashes. After a week of that with no incidents, they are all now to be in the living room with no problems. The first week at bedtime, I kept him downstairs in his crate while we slept upstairs. That was horrible, his whining and barking. The first night, he did it for 3 hours. When he finally got used to it and would only bark for no more than 5 minutes which took a couple of weeks, the next week, I let him graduate to sleeping outside of the bedroom. After he learned the whining would not get him inside the bedroom, about a week, he was able to sleep in the bedroom with us. There have been no issues with all of them sleeping in the bedroom. Today was the first day that I have finally starting letting Speedy and Bear outside to play with each other without leashes, and then I'll let Sadie and Bear outside so they can play without leashes. Speedy and him played pretty rough, but there were no issues, except for Speedy trying to display his dominance. When he did knock Bear over and roll him over and had his body covering his, I could tell bear was nervous, so I got speedy off of him and made him lay down to get him to relax because he was amped up. Sadie and Bear just chased each other around and didn't play much after that. I still think they are trying to figure each other out. I am still scared to let all of them go out at once, which I will discuss in the next paragraph.

The only time it seems like any aggression is shown towards each other is when Speedy and Bear play around and Sadie starts to get jealous or anxious, and she starts barking and walking up to them. I am worried she may try to create a fight, so I usually try to redirect the behavior before a fight occurs. I'm not sure how to go about helping her relax when these two guys play and help her realize that she doesn't need to join in or protect anybody. She has always been extremely protective over Speedy and myself before I added the Bear to our pack. I just don't want Speedy and Sadie to gang up on Bear if something goes wrong. Am I doing something wrong by stopping her when she approaches or should I let her to see what she does? It seems like it is more of an anxious type bark/whine like she doesn't know what to do. I may also be a little nervous because Sadie did bite Bear's ear the second day that I had him and drew a little blood. Sadie was sitting on the sofa, and when he approached on leash, he got bit. Well, I moved and was about to move him back, when he bit back, but I was in the middle and got bit in the side instead of Sadie. It wasn't a bad bite, just a long scrape, but at the time I thought it was awful, because it was bleeding alot. Now none of the dogs are allowed on the sofa until I tell them they can get up, and that seems to work. There has been no further issues of the agression trying to claim the furniture once they realized it's my furniture and I control it.

Any suggestions would be greatly appreciated!