I thought my almost-year-old Holland Lop rabbit, Emma, was lonely, so I got her a six month old Mini Rex, Lilly, as a companion. When I got Lilly, I had to put her in a temporary pet store cage (that my rat was in, and moved him to a tank) as I potty train her. I haven't started the potty training yet, but the three times I've put them together they pull each others fur out, grunt at each other, and chase each other around . I thought of it as aggression, but my mom said it was just dominance, I thought they mounted each other for dominance, am I wrong? The woman I got her from said they were more than willing to take her back if it didn't work out, but it seems like It would be mean to do that, but then again I can't guarantee that things are going to work out, like, if she can't be potty trained then I can't really put them together (since Emma lives on carpet) and if they keep on fighting, then I would have to keep her in the small pet store cage and my rat in the 20 gal. tank, I can't stand seeing either of them in the small cages, so what do you think I should do? I've heard spaying helps, but we can't afford it, I also don't have room for another cage, if they have to stay separated. I know I wasn't prepared for anything to go wrong, but I just wanted to make Emma happy, and it doesn't seem like it's going to work.