This is an article, a podcast, and an eBook.
http://www.leerburg.com/introducingdogs.htm

It also sounds like you need to do some work with the other two. It's NOT too late to establish structure.

http://www.google.com/custom?domains=leerburg.com&q=groundwork&sa=Google+Search&sitesearch=leerburg.com&client=pub-9352112989043417&forid=1&channel=8149920423&ie=ISO-8859-1&oe=ISO-8859-1&safe=active&flav=0000&sig=XaJqMPqToCkex0QJ&cof=GALT%3A%23333366%3BGL%3A1%3BDIV%3A%23999999%3BVLC%3A336633%3BAH%3Acenter%3BBGC%3AFFFFFF%3BLBGC%3AFF9900%3BALC%3A333366%3BLC%3A333366%3BT%3A000000%3BGFNT%3A666666%3BGIMP%3A666666%3BLH%3A86%3BLW%3A100%3BL%3Ahttp%3A%2F%2Fwww.leerburg.com%2FPhotos%2Fheadlogo.jpg%3BS%3Ahttp%3A%2F%2Fwww.leerburg.com%3BLP%3A1%3BFORID%3A1&hl=en

I would also order Video #302
http://www.leerburg.com/302.htm
and this one:
http://www.leerburg.com/301.htm

I would STUDY these videos.

I would be absolutely conscientious about following the advice about introducing the new dog. You have started off badly, but you were right to separate them. The scared dog must be protected by you, the pack leader, both from attack and from FEAR of attack.

I think the videos are going to change the way you live with your dogs, and that you need that; you have three dogs, and that many dogs requires super-leadership skill and vigilance.

IMO, the third dog was an unwise decision; you already had a dog who is not under control ("a little mean" to your mother; trainers refusing to return to your home); now that you have taken that step, you owe it to these dogs to start immediately to establish pack structure. It's no favor to any of them, including the older one, to let him dominate the house. That's YOUR job.

This isn't meant to be harsh; it's meant to urge you to take action immediately to change the situation.

You were smart to post here and ask, because you will get straightforward advice here from some very experienced handlers and trainers.

P.S. Welcome to the forum!

Thanks for the quick response, after the incident happened I found this website and proceeded to sign up here. After I learned that 3 is a pack I felt awful. When we brought Cleo into the house she was welcomed with open paws, I was hoping that they would welcome Aslan the same way too. Do dogs retain the pack structure/mentality even after one of the dogs passes away? I am very unhappy with the way the first meeting happened, I feel terrible. Sorry but I have just one or two more questions:

How brief should we keep the meetings? & If those meetings go sour ( like they bite the puppy's butt) how long should we keep them seperate?

I'd also like to thank you for providing the information via links. We'll read them together.

p.p.s: thanks

Hey Matt! Welcome. You're doing the right thing by researching this dilemma. I just want to say this...You should keep them separate until you're comfortable as the pack leader. Where you're at right now, it sounds like you don't even know what it means to be a pack leader. That isn't a bad thing; I tell people all the time that the first step to improving yourself is taking an honest inventory of your skills and shortcomings. You know what you need to learn, the next step is to study!

Just to give you some context, you may need to keep these dogs separated for several months, even years...You won't know that until you start to do the work with them.

Don't hold on to how the first meeting went. Remember what you learned, and cut the emotional baggage right now. It's done. Now it's time to move forward and develop relationships with these dogs in a new way. This will be harder for your mom than it is for you, and just as important for her.

Again...to reiterate, I wouldn't even consider introducing the dogs to each other at this point. You've got a lot of one-on-one work to do with at least one, and probably all three, of them before they're ready for that.

When they are, I don't think you'll need to hold the puppy down and present it butt-first. I wouldn't recommend that. Think about how vulnerable the puppy will feel, and decide if that kind of exposure is something you want to subject him to.

Finally, I'm sure Connie will agree that this video is a must have: http://www.leerburg.com/308.htm

I know it seems like a lot to handle, but you can do it. Also, notice that Connie said to STUDY the videos. Get a notepad and a pen, or a laptop or whatever you use, and take notes. Develop a plan based on what you see in the videos.

 Quote: David Eagle

I wouldn't even consider introducing the dogs to each other at this point. You've got a lot of one-on-one work to do with at least one, and probably all three, of them before they're ready for that.

I agree. Consider the time an investment in a happy and non-anxious future, because it is. DON'T obsess about not having the three frolicking together yet. The pup especially -- you do not want to start out her life with fear and with the belief that she has no protector-pack-leader.

I would just do the groundwork and not even worry about the timeline.

 Quote: David Eagle

Finally, I'm sure Connie will agree that this video is a must have: http://www.leerburg.com/308.htm

Yup! It's brand-new, and I already have it!!