Has anyone found any particular greens that actually make your guinea pigs get diarrhea or loose stools? I am trying to figure out why one of my girls gets a little bit of a dirty bum. Her daytime droppings are totally normal but I never see the night droppings or caecal pellets, so they may be soft. I am wondering if one of the foods isn't agreeing with her. They get 1 cup of mixed greens in the morning and 1 cup at night for two pigs, unlimited hay, water and I keep their pellet dish full. They don't eat a lot of pellets. I have even gone to mostly organic greens to reduce pesticides and chemicals. Anyone else have a slight dirty bum problem? Maybe this is normal. Please any info would be appreciated.