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1. train her yourself. do this separately from the other dogs. if she is in the midst of the pack make sure she will come to you at any time. even when she is playing or doesn't want to come. start early and reward heavily for coming to YOU immediately.

2. feed her yourself. this will make her look up to you. the best thing i ever did with my pup; teach her "leave it". at dinner time put a leash on her (before then put her food in her bowl) and put her bowl down. she will go for the food immediatly, gently keep her from it as you tell her to "leave it". as soon as she stops pulling and looks at you to see why you aren't letting her eat tell her to "eat" take off the leash, and leave her be.

3. ignore her when you have left the room/gone somewhere. this will make her crave attention from you.

4. love her! dogs can sense your love :)

5. you could try what this website says: http://www.wolfweb.com.au/acd/alpha.htm

EDIT: Marianne, you might be right in some aspects but...it is also good that yor dog respects you. dogs who don't have sent their owners to the emergency room. i would still do some things like giving the dog a treat for moving out of your way. etc... also, the definition of pack is: "A group of animals, such as dogs or wolves, that run and hunt together." that doesn't sound all too Hierarchy to me, it just says they hunt Together. " When in a multiple dog household, the leader changes as the dogs age and a leader that all the others give way to can be one dog one day and another another day." that is still a LEADER. that is still someone who eats first and growls at the others if another dog tries to take his bone. the others still SUBMIT to that dog.

If you want a "companion" then get rid of the whole idea of "master". You don't dominate a dog to become a companion of the dog;

http://www.woofology.com/alpha%20myth.html

You train, play, feed, and enjoy your dog, then you have a companion.

Here is how to effectively train;

http://www.dogtrainingbasics.com/

EDIT:

Gwyns "pack animal" site has been outdated by at least 10 years. Dogs have been found not to be "pack" animals as they do not work as a dictionary defined "pack". They do not hunt as a pack when feral, nor do they breed as a pack not is the one "alpha" in a group of dogs.. When in a multiple dog household, the leader changes as the dogs age and a leader that all the others give way to can be one dog one day and another another day. They simply do not form packs nor is there an alpha as known by wolf researchers. If you are truly interested in learning about how dogs function, read the definition of a "pack" and you will see how wrong that assumption is.

I was in your same situation 3 yrs ago (i was also 17). we had family dogs (5 of them at the time lol). so anyways, it was 2 days after xmas 2010 and i found this hurt little Black Lab puppy, and took her in (after begging my mom/stepdad). she healed up pretty fast, except she still limps to this day, and was just the best puppy, and everyone loved her. She was my first dog so i wanted her to BE mine, not anyone elses. I was worried that she would listen to others in my family and not me. so what i did was when ever she was in the house (it was very cold January in Oklahoma, so she was in a lot ) i would keep her in the same room as me at all times. and i would give her a treat every time she did something i told her to, like lay down or come here. it didn't take long, before she realized i was the boss, and not anyone else. I put in a lot of time, and my mom said "OK, shes yours don't ask for help" (she would have helped but i didn't need it). Keep in mind that a puppy is [usually] a lot of work, because you have to house train it, teach it not to chew up stuff,ETC...Its not all about you being the master. I got lucky and i didn't even have to house train my dog (AT ALL!) even though she was only 8-10 weeks old, and was a stray til i took her in, so i know nobody trained her (my neighbors dog had pups and they moved and left them).

It might not workout for you like it did for me but all you can do is try. Like i said try giving her treats when she listens to YOU, and try training her without others interfering/helping.

Good luck!

Here some other things that could help. Be the one who takes him/her for walks. Go outside and play with him/her. Since it is a pug and most likely wont shed fur, let it sleep on your bed if you are comfortable with that. And just spend more time with him/her more then anyone else does. I hope I helped.