Quote Originally Posted by sorraia View Post
Do you know how old she is? In what ways have you tried to introduce her to a cagemate?

There are ways to successfully introduce even adult rats, but it can take time and patience (depending on the rats involved), and it's a specific process. Since rats are territorial animals, you need to start on completely neutral territory. If you just throw two rats together in one rat's territory, it's asking for a fight to break out. Sometimes older rats will accept younger rats better than other adults, but you have to be careful doing this because an adult rat can also severely injure or kill a youngster. If you can find one or don't mind spending the money, a neutered male can make a great companion too, since most rats will accept the opposite sex (even if that opposite is altered). If all else fails though... she might just have to be one of those rats that lives alone.
She is approximately two years old. I have tried having a separate cage for the other rats that I have introduced and have put it right next to her cage. I have also tried introducing her to other rats in my bedroom with the door closed while I sit on the floor and she does not like any other rats at all. I am rather nervous about the aspect of even introducing a neutered male to her. She pins other rats down and bites very hard, hard enough to leave open wounds. I am working on the immersion training with her now and she seems to be doing really well with it. She is a total sweetheart with me but no one else. When my boyfriend approaches her she just runs away and comes to me.