I have a 10-year-old spayed female who stays indoors, except for going on the screened-in porch. She is a silky, semi-long haired car (black) and has for some months had a problem with throwing up right after eating. I feed her only dry cat food and use the furball formula, but it doesn't seem to have any beneficial effect! Her stools are hard and she tends to ocassionally pee and poop on my bathroom floor instead of her litter box! I have tried to get her to take mineral oil, but she won't eat it. She started shedding as usual in the spring, but now is shedding heavily! I would appreciate any ideas.