My cat suddenly got diarrhea without eating anything; I gave it some smectite but it didn’t help. It’s still energetic, but I don’t know why it keeps having diarrhea.

If your cat has frequent diarrhea but still seems normal, this is mainly considered to be caused by indigestion, gastroenteritis, or parasite infection. Check your cat’s food carefully for any spoilage. You can first fast the cat for a while and give it some pet probiotics to see if the symptoms ease. If the symptoms gradually improve, adjust its diet and feed smaller amounts more frequently. If your cat keeps having diarrhea, take it to a veterinary clinic promptly for examination and apply the right treatment based on the results.