Our expert says:
It sounds like the condition is still not under control especially with the fact that the cat is soiling in the house now. Behavioral causes are a possibility but this is normally urination and not defecation , and I think that one should rule out all the possible medical causes first so I would suggest that she gets a full clinical exam by your vet and to start with the basic work-up of chronic diarrhea. Something like a fecal analysis is a basic test and can rule out possible parasitic causes for example.
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