Curlytails, thanks! I'll talk to my roommate about putting all of the toys away and see if we can come to some kind of decision. I think that would take away some of the temptation.
The funny thing is, Cody isn't really all that toy motivated. I'm wondering if it is because his toys are the ones that smell like Moe that I brought with us to ease their separation. Whatever the reason, his toys are in my room, and the chihuahua doesn't have access to it.
Like I said before, after the first fight, I started feeding and giving Cody his treats in his crate. It's something we'd been working on anyway to try help him see his crate as a good place. Both of her dogs have allergies and are on limited ingredient diets, so it helps with that too. I just hate crating him so much since his has proven that he is trustworthy in the house. I had hoped to be able to let him out after about a month when the newness of the place wore off.
We also started gating off portions of the house, so they both have somewhat equal time out around the house without running into each other. They pretty much ignore each other when they are outside, but we still don't let them out at the same time without both of us with them to supervise.
I do feel a little better about the situation today, and I think once school starts on Wednesday and we get settled into a routine things will start to get easier. I'm not kidding myself, though, I know it's going to take a while, but I also think that a more structured routine will help.