what causes diarrhea in older cats
Inflammatory bowel disease is a common condition in older cats, occurring when their intestinal lining thickens and becomes painful. This makes it difficult for the cat to eat, causing weight loss first, followed by frothy vomit and mucousy diarrhea. A good indicator that this is what's affecting your cat is abdomen pain. Gently press on his abdomen and if he cries out or tries to get away, get him to your vet for testing.