Mutiple Jacks

Question
Awsome thank, i understand I'll get another female if it doenst work after a few weeks or months if she starts getting into fights with the others amybe we can find her another fully permant home(?), I always get puppies never adult dogs I would never try have all teh truble introdcuing adults to an adopted adult dog, the puppy will be 6-8 weeks old...I'll also try too pick a more submissive puppy....would you be able to help me with how to pick a not so dominate puppy from a litter? what should I be looking for?

Thank you for your opions and for your replys i was 80% female on the pick before emailnig and now am 100% I persoanly like male dogs but never as much as females Its just me, To let you know thou my labrador is middle of the road typed in domance she is below the jack russell terrier in the rank of the hosue and the boston terrier is lower then her, all three dogs do get along with my mothers shi tuz X's and try get along with my sister yorkie poo when she visits but that little dog is very snappy with larger dogs and grumy lol, thansk again.
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Hello, Thanks but do you think it would be possible to have another male dog in teh hosuehold? do you think another female would cause alot of bickering?
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Hi, I sure hop you can help me with this, I have three dogs a JRT, BT and lab, male female female, all fixed I am planning another jack russell next summer and am not sure on what sex to get I don't persoanlyl care if I get a femal eor amel but want to know what will be best in this household. thanks.
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Hi Tara
I believe this is a personal choice you have to make on your own. There is no way to tell in advance how these animals will get along. Some do well, some don't. Sorry, wish I could help more, but it's a crap shoot.
Good luck!
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If you're getting a puppy, your chances of them getting along might be better. The puppy will learn quickly who's boss - but then again, he or she could have a very dominant personality and try to run the show making everyone crazy! It's the same with females.  
If you are getting an adult dog, there is NO way to know until you experience life with all of them. It also depends on the personality of your three dogs whether or not they will welcome a new comer.
Geez, I really wish I could help more, but I'm telling you there are no absolutes when it comes to animals.....
If I were you I'd take my chance with a male, even if only to even out the numbers.... 2 males, 2 females.
Tough decision, good luck!

Answer
Hi Tara,
I'm glad it's a puppy you'll be getting. You sure have a busy household! - where are you getting your puppy? A pet store or a private breeder or a friend?  You shouldn't take her/him before 8 weeks old.
A passive puppy will lie on his/her back in your hands without squiggling for a minute and will not look at you directly in the eye - a passive puppy will lie down on his or her back during rough play with the other puppies (as if to say, OK, you win).  
The littler the dog, the more yippy they are! That's a good sign they all get along with the yorkie too.
Good Luck Tara!