Crazy running wheel can definitely lose weight. . . . Besides, mice are not fat. . It's just that the hair is too thick . Is that male mouse eating crazy? . Don't worry, it's okay. I think I have learned to play the wheel. Running wheels are mice's favorite toys. Some mice can run for more than an hour or two. . . I guess I just ran too much and lost weight. Hair removal may be hair changing or allergic to sawdust. . . . I think it's molting. . . The pudding is yellow at first. . Slowly, the hair will turn black. . I think it's molting.