Hi Nicole,
Are you actually thinking of getting a new pup now, or is this for the future, as I noticed your pup is still quite young.
It doesn't really matter what combination you get, most of the time they will bond and become pals, However sometimes you can get a bad mix and they just don't like each other, usually when they are both quite dominant and won't back down with each other. I have a pack and the alpha of my dogs is my old girl willow, she keeps them all in check, even my 2 boys. I would say its still very early days and you have barely enjoyed the company of your new youngster give it a little time take her to puppy classes and see how she develops around other dogs.
The obvious thing to think about is a dog/bitch combination and the possibility of an accident
. When a bitch comes into season you will find your dog becomes very agitated and excitable and may bark and whimper alot as he wants to be with the bitch. He will cock his leg on your furniture and let of an aroma that is very very PUNGENT in his spray
. When he gets the chance he will also pee on your bitch which can also take your breath away when she comes to you for a cuddle or your whinjy arse aunt comes round and she jumps up at her stinking of PEE. NOT NICE AT ALL
Give yourself time and decide in a few months, 2 youngsters so close in age can be a real handful.