Casper: Ava and Mizzie haven't met really. Tried to introduce them and Mizzie just ran upstairs after scratching me up a bit.
Also I think Ava is a little bit afraid of cats? I'm not sure, we had her at my friends once (she has a cat) and Ava just tried to avoid the cat. It also kept going out of its way to bug her though ._. the second time with my friends other cat it just stayed clear of Ava and Ava it, that's why I'm kind of hoping Mizzie can get over it eventually

Catmandu: Thank you I'm hoping it all works out too

Taz_Zoee: I actually think my grandparents are thinking of getting a puppy to be honest; recently around 80 dogs were found in a house near my area, and 33 are in the adoption center here, and when we went to drop off supplies we picked up an adoption sheet. So Mizzie may have to live with one anyways, but yeah, I would bring her home if living in the apartment didn't work out.

MoonandBean: she's actually collie/shepard, but I agree. I think for any cat/dog relationship the cat needs to be boss because they have more limits then a dog so to say? My boyfriends cousin was living over there once with her cat, and their dog at the time wouldn't leave the cat alone and got a nasty scratch to the forehead. Miz doesn't have claws though so a bat to the head would just tell Ava to back off rather than hurt her lol

Freedom: The thing about moving with Miz is that she'll be introduced to a new home, partially new people (she's met all the roommates before just never got really used to them) and a dog. So I'm glad that I don't have to feel bad about one of them having dibs against the other space wise (not very nice to lock up an animal that runs the roof so to speak). So if all of us are ever out I can lock either of them in the bedroom and the other can deal with it. I have absolutely no expectations for Miz to be comfortable right away, and I know that she'll take time with getting used to it and Ava. I just really hope it works out.

Thank you everyone for the help. I feel much better about this right now, the only thing I have to work up the balls to do now is talk to my grandma about it ._.