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Hello this is Dr. Holloway but you can call me Dr. H for short.
I am sorry to hear that Scruffy has been having soft stool for what seems like an extended period of time. If the antibiotics showed no improvement then this most likely is not a condition that can be treated with conservative treatment and I have suspicion that there is something else going on with the intestines themselves. Lymphoma (cancer of the intestines) comes to mind as this is a very frequent occurrence in cats and will cause chronic loose stools with relatively normal bloodwork findings. For detection of lymphoma, an abdominal ultrasound is usually recommended to look for masses along the small intestines. This would be my next recommendation.
- Dr. H
Also I wouldn't recommend switching the food too frequently. I know this is tempting to do but frequent meal switching can worsen the loose stool. Try to stick with a high fiber senior diet.
Metamucil also works great as a fiber additive to promote bulking up of the stool.
If she does have lymphoma or if your vet suspects she does then there are treatment options available.
Do you have anything to add at this time?
Or any questions about my recommendations so far?
Are you there?
Do you also have a copy of the bloodwork to send to me? I know you mentioned it was all normal, however sometimes a second review can reveal some potential disease processes that could explain the chronic diarrhea.