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i have two female rats and they are sisters. the trouble i am having is that one of them is getting fat and the other one is getting skinny. tried seperatin them but they just got depressed but the smaller one has a cut above her eye and i am sure that the fatter one is bulling her. also i want to walk them on their harnesses but im scared they mite get squished but they hate their wheel and how else do i get them to exercise more.