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HI this is DRB and I would be happy to help you with this. First off probiotics will not likely help the diarrhea.....so I would not recommend that. Also if your cat has been controlled on steroids for a while without any diarrhea the possibility of gastrointestinal lymphoma or hyperthyroidism due to the age of your kitty needs to be considered. At the very least you need to see your vet and have a senior bloodwork profile down to rule out metabolic causes of the diarrhea since these are very common in cats. A CBC, chem panel, Felv,FIV, heratworm test, with full chemistry, urine and thyroid testing should be done first. Also parasite testing should be done. if none of this turns up anything then you could be dealing with GI lymphoma. If you are not interested in treating that then I would try low dose metronidazole added to the Prednisolone for the diarrhea and that will likley work very well for awhile. I hope this helps you. Sincerely, DRB
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