Today is Falken's 2nd day home and everything has been going really well, except, Roxie has suddenly become food aggressive. I feed her first but if Falken comes near me while I'm preparing the food Roxie snaps and growls at him. Even if he comes near her food container she growls. Don't really think she'd hurt him but don't want to take any chances. Should I let them sort it out (while keeping close watch) or can someone give me some tips on how to handle this?