Is The Same Breed, As You Have, Best For A Second Dog?

I have a four month old female Japanese Chin. I’m considering getting a second dog, preferably another chin, a papillon, or a yorkshire terrier. Those are the three choices I am thinking of (even a yorki-mix possibly). The obvious choice would be to get another chin, but since there are two sizes of chins, those under 7 lbs (hard to find) and those up to 20 lbs, it’s very difficult to find the smaller chins and that is what I would want. My little girl is 2.5 lbs at the moment and will maybe get to around 5. I have looked everywhere for a male chin that will be about her same size, but they are VERY hard to find. I’m considering a male papillon or yorkie (or yorki-mix). Which is the best choice out of all of them and should I even get another one. My little girl is very well behaved, potty trained, doesn’t bark/cry, she is perfect! I’m concerned getting another dog may ‘make’ a problem, then again it could help her come out of her shyness in new situations. What should I do?

Is The Same Breed Of Dog Better With Each Other And Is A 2nd Puppy A Good Idea?

I have a four month old Japanese Chin (female) and am considering getting another one. It has been difficult to find another chin that is about the same size as she will be (since she will be small around 5 lbs and some chins can get to 20 lbs). I’m wanting to get another one fairly soon, so they can get use to each other and grow up together. I’m having a hard time finding another chin, but am considering getting a papillon. I’m just concerned that a papillon might be a little more fiesty than she is. She is very laid back, likes to play, but likes to cuddle and sleep as well. She isn’t one of these puppies that bites and chews on everything. She is actually the perfect dog, already potty trained and everything.
Also, would a male or female be best to get since I have a little girl. I will get they spayed or neutered because I think they chin will be too small to have pups, plus I don’t want to breed. I’m worried that males will hike and try to ‘jump’ on my little female.