
I think you would probably be fine with another bitch, but for a really easy life (well, as far at getting the two dogs to be friends) get a dog.
So long as you are happy to get one of them n/s, then it shouldnt be a problem at all.
Mostly, bitches get on together pretty well, but, an its a big but, IF they do fall out, they very rarely sort it out, they jsut keep on squabbling, until something awful happens, and one kills the other one.
This isnt a specific breed thing, its just a bitch thing, and it entirely depends on the character of the bitches in question as well.
Good luck whatever you decide.
Em