Thank you all so very much.

Jen--
I appreciate your input, and was thinking the same thing myself. However, once when Kito and Abbey got into a fight, Abbey ended up with a big chunk taken out of her shoulder, and many stitches. I really don't want to have to go through something like that again. When they just have a little argument, I let them go, as long as it doesn't get nasty.

The nastiness has only escalated recently. They have been a little grumpy toward each other lately, but no fights until recently.

I am going to speak with my vet, as well as a woman I know here who is involved with PAWS, our local rescue, and see who they recommend.

Clara--
those are wonderful tips, and I do notice those warning signs--Abbey gets a very distinct look on her face when she is getting mad--it is very obvious. Neither of them are allowed on the furniture, but I do notice them trying to push each other down the stairs at feeding time (I get the food ready downstairs, and Abbey and Riley eat down there, with Jada and Kito eating upstairs--should that be changed??). I did put them in a time out last night, until they settled, and everything seemed fine then, and everyone is getting along today.

They do not stay together when we are not home, so they are supervised when together, at all times.

We made a mistake last night though--neither girl was wearing her collar, and it made it virtually impossible for me to get them apart--especially since I was trying to get Jada, and she doesn't even have a tail to grab.

Thanks for all of the advice, I really appreciate it, and I will keep everyone updated on the situation.