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Hello. My name is***** and I am a veterinarian that can answer your question. I understand that Pishi has been defecating outside the litter box and it is appearing green with mucus. I am sorry to hear about what is happening. Is this the first time any of these things have occurred? Any vomiting or hair balls in Pishi's past?
Thank you for that information. Mucus in the feces indicates there is inflammation in the colon. Cats will typically break normal litter box habits when there is discomfort somewhere in the body, so putting these two things together would indicate that there is inflammation in the colon, which is resulting in this change. However, if there is an issue with litter box avoidance such as stress with using the litter box then that falls under the category of anxiety. Anxiety can occur if there are too few litter boxes, if the litter boxes are in a high traffic area, or there was an altercation between the cats while Pishi was using the litter box, which then creates a negative association with using the litter box. This would not cause green or mucus in the feces, which leads me to assume there is inflammation that is causing this instead.
The cause for the inflammation becomes the next step and this can be from parasites, sudden changes in food, intolerance to certain ingredients, or a food allergy. Other disorders such as inflammatory bowel disease or inflammation can also possibly cause these signs. A fecal exam would be a recommendation to start ruling out some possibilities. Regarding treatment, your veterinarian will have access to a medication called, "Metronidazole" which is helpful as an anti-inflammatory on the intestines.
Some helpful over-the-counter treatments for this would be probiotics or adding fiber to the diet.
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