Which sex would best get along together? I have a female chihuahua puppy and am looking to buy a yorkie. Should I get another female or a male?

I'm taking my two month old male puppies on a trip with me and the people I'm staying with have a year old female chihuahua.
They don't have her spayed and I don't want any new puppies to result from this.
there purebred chihuahua babies

Our female Chihuahua just had six puppies with a Bichon. Five of them have white and merengue colored, curly coats and the other one is alot smaller than the others and has a plain white coat with straight hair (looks alot more like the Chihuahua but with a little longer hair).

I have a female chihuahua that will be having puppies in a couple weeks. She is small, under 4lbs. The vet doesn't forsee any complications but I have heard that chis can be difficult sometimes. Anyhow I have never had experience with any breed having puppies. I'm looking for tips and things I should have ready.

I have just got a female chihuahua and shes beautifulll
but tiny tiny
Her mum is only 4 pounds and so are some of her older brothers and sisters so im guessing she will be the same

anyway

I need to get some clothes for her, its really cold outside at the moment and I know chihuahua's don't like the cold so I want to keep her warm.

Does anybody know any good websites to buy tinyy clothes for my chihuahua and also I haven't named her yet so any cute ideas please feel free to tell me :]
I was thinking of Pearl

as shes so small and shes cream coloured all over
:]

what do you think?

keep with the suggestions im loving them