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My cat has diarrhoea — what now?

Most cat diarrhoea settles within a few days, but kittens, senior cats, and stool with blood or black stool cannot wait. Start with the colour and the shape.

First, how urgent is this?

Go now

  • Bright red blood in the stool.
  • Black, tarry stool.
  • Diarrhoea with vomiting, very low energy, or refusing water completely.
  • A kitten or senior cat with ongoing diarrhoea and clearly falling energy.
  • Sudden collapse, or unable to stand.

Contact your vet today

  • Liquid stool lasting more than 2 days.
  • Mucus in the stool.
  • Pale, grey or yellow stool.
  • Diarrhoea with weight down 5% or more within two weeks.

Record and observe

  • One soft stool, then normal shape, with normal energy and appetite.
  • Brief soft stool after a food change, improving over a few days.
  • Already under vet care: record frequency, shape and colour (photos), and bring the record to the next visit.

Before you set off

  • When, how often, and what shape, colour and amount, with photos.
  • Whether there was blood, mucus, a worm or a foreign object.
  • Any recent food change, scavenging, trip out or contact with other animals.
  • Any change in drinking or appetite.
  • A list of medicines and the time of the last dose.
  • Do not give anti-diarrhoea drugs or human medicine, and do not withhold food or water on your own.

What your vet may ask and do

  • Ask: when it started, how often, and what it looks like.
  • Ask: any blood, mucus, vomiting or weight loss.
  • Ask: food changes, trips out, contact with other animals, and vaccination history.
  • Do: weight, hydration check and abdominal palpation.
  • Do: a stool test (parasites, bacteria, virus).
  • Do: blood tests (electrolytes, kidney values, protein).
  • Do: fluids for a kitten, a senior cat or an ongoing case, with admission for severe ones.

Where to go in Hong Kong

Call the clinic before you drive over, to confirm tonight's arrangements and the location.