Hi Jessie,
Hate to say it, but you're going to probably get conflicting advice here too. :rolleyes: There are no absolutes in this matter. I've heard from "experts" that the dogs most likely to not get along are two females. (two of the same breed or two from the same litter are supposedly most likely to have permanent problems).
I prefer females, especially with smaller dogs. (I don't have to worry about a wet hand when I pick up the bitch outside after peeing & asthetics on rubbing tummy games---that's just me, though). I've also had them spayed or they were before I received them.
The last 6 dogs I've had have all been females, two even from the same litter.... no problems. I even had three females at the same time --10 year old Yorkie who disliked anything other than people, 4 year old doxie/westi mix, & a Cocker/Chihuahua puppy. The three managed quite well for 3 years in the same household until the Yorkie died. I still have the other two & they are inseparable.
It comes down to what you feel you can handle, what you want, & the personality of the dog that you have. Does she like puppies? Is she willing to follow your directions on who belongs to the household. Do you want a male or a female?
There will be those who will say that a male is assured of being accepted by your female without any trouble. There are also those here who just prefer males, like I prefer females. It's pretty much individual taste. And unfortunately or fortunately, it's up to you to decide in the end.
Hope I haven't confused you further :D Good luck
toodles