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Diarrhea in cats

Short answerOne soft stool in a bright, eating, drinking cat is a note-and-watch event; if it lasts more than a day or two, it becomes a vet question. Keep fresh water available, keep the diet boring and familiar - don't starve the cat and don't improvise a buffet of remedies - and log what happens. Diarrhea that lasts more than a day or two, comes with vomiting, lethargy, blood or a cat who stops eating, or happens in a kitten or senior, is a vet call, not a wait-and-see.

Sources: the Cornell Feline Health Center, linked at the end.

The usual suspects

DietaryAn abrupt food change, rich treats, milk (most adult cats are lactose intolerant), or garbage-can diplomacy. The most common cause, and the most fixable.
StressMoving, a new pet, boarding, even furniture rearrangement can show up in the litter box.
MedicalParasites, infections, inflammatory bowel disease, food intolerance, thyroid disease and more. This column is why duration matters - the benign causes burn out quickly, the medical ones don't.

Home care for the mild case

For an otherwise normal adult cat with a soft stool or two: water always available (diarrhea dehydrates faster than people expect), the usual familiar food in normal portions, and nothing new introduced "to help" - no fasting, no sudden rice-and-chicken experiments unless your vet has told you that plan before. The standard veterinary advice is consistent on the point: brief and mild gets watched; anything more gets examined. Probiotic products formulated for cats are a reasonable question for your vet, not a substitute for the exam when the red flags below show up.

Red flags that change the timeline

  1. Blood in the stool - red or black and tarry, both count.
  2. Vomiting joining the diarrhea, or any lethargy, hiding, or refusal to eat.
  3. Duration: longer than a day or two - Cornell's guidance is to seek veterinary care as soon as possible at that point, sooner if poor appetite, lethargy or vomiting joins in.
  4. The vulnerable cats: kittens, seniors, and cats with known conditions dehydrate fast - same-day advice for them, not tomorrow's.

What the vet will want to know

When it started, how often, what it looks like (color, mucus, blood), what the cat ate in the days before - including treats and anything stolen - and what else changed at home. That is exactly the record the meal and vomit log keeps, and a fresh stool sample in a clean bag is a useful thing to bring. If a recent diet change is the likely trigger, the diet transition guide explains how to walk it back safely.

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