So I'm trying to introduce 2 new young males to my current mischief of 2 girls 2 boys. The girls and the less dominant boy took to the new kids immediately, but I'm having trouble with the dominant male. He has bitten me twice now, and the second time he didn't let go which was scary. I've never seem this behavior in him, he's always been a squishy lump and has never bitten or been aggressive towards me in any way. I don't want to allow that kind of behavior though, and I've heard about people saying they're the alpha of their rats and some have a co-alpha if you will. Does Pepe think that he's dominant over me? How do I get him to understand he can't attack me, no matter how defensive he gets? Ive tried all sorts of things to get him to understand but nothing works. This is a completely new side of him, this behavior came completely out of the blue. He chases his brother, but he's never gone for me like that before. What can I do to work with him?