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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsSudden diarrhea in a cat can follow a food change or stressful event, but it can also signal parasites, infection, toxin exposure, or another illness. Diarrhea is a symptom, not a diagnosis, and stool appearance alone cannot reveal the cause. Contact a veterinarian promptly if symptoms are severe, the cat seems unwell, or a possible toxin exposure occurred.
Six possible reasons a cat suddenly has diarrhea
These are common categories of possible causes, not a ranking or a way to diagnose your cat at home. A veterinarian will interpret the symptoms alongside your cat’s age, health, diet, exposures, and examination.
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1. An abrupt food change or food intolerance
Changing foods suddenly can upset a cat’s digestive system. Cornell Feline Health Center notes that “an abrupt change in diet” may cause diarrhea for a few days. Food intolerance or allergy can also be a factor. Cornell Feline Health Center and VCA Animal Hospitals list dietary changes among possible causes.
2. Stress or a changed routine
A stressful event, such as a long car trip or a stay at a veterinary clinic, can cause brief loose stools in some cats. A recent change in routine may be relevant, but it does not rule out other causes.
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3. Eating something unsuitable or exposure to an irritant
Dietary indiscretion, chemicals, and poisonous plants can cause digestive symptoms. If you suspect your cat has eaten a toxin or contacted an irritant, call a veterinarian promptly; do not wait to see whether the diarrhea passes.
4. Intestinal parasites
Worms and other intestinal parasites can cause diarrhea. A veterinarian may request a fecal sample or testing to check for parasites.
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5. Infection
Bacterial or viral illnesses can cause diarrhea, including serious diseases such as feline panleukopenia. Vaccination status, contact with other animals, and your cat’s overall condition help the veterinarian assess this possibility.
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6. Other digestive or systemic illness
Inflammatory bowel disease, cancer, organ dysfunction, and other systemic illnesses can also present with diarrhea. Recurring or prolonged symptoms deserve veterinary assessment rather than repeated home treatment. Merck Veterinary Manual discusses disorders affecting cats’ stomachs and intestines.
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When to contact a veterinarian
Seek prompt veterinary advice if diarrhea is severe or bloody, or if your cat is weak, lethargic, vomiting, feverish, painful, dehydrated, losing weight, or not eating. Cornell advises seeking care as soon as possible when diarrhea lasts longer than a day or two and is accompanied by poor appetite, lethargy, or vomiting. VCA advises consultation if frequent liquid or semi-liquid stools continue for more than two days. These are general guidelines, not a reason to wait when your cat is deteriorating.
- Call sooner for a kitten, older cat, or cat with another health condition. These cats may need advice earlier than a healthy adult.
- Take possible toxin exposure seriously. Contact a veterinarian promptly even if diarrhea is the only sign so far.
- Watch for fluid loss. Severe digestive fluid loss can cause dehydration and electrolyte imbalance and may progress to shock, according to the Merck Veterinary Manual.
What you can safely do while arranging advice
- Keep fresh water available.
- Call your veterinary clinic and describe the symptoms and when they began.
- Do not give human or over-the-counter diarrhea medicine unless a veterinarian specifically instructs you to. Some such medicines can harm cats.
- Do not fast your cat or make a major diet change as a universal home remedy. For some otherwise healthy adult cats, a veterinarian may recommend a brief feeding adjustment or a veterinary gastrointestinal diet; the right approach depends on the cat and symptoms.
- Ask the veterinarian before giving supplements. VCA notes that a veterinarian may prescribe probiotics, but product quality and effectiveness are not always known; a supplement should not be treated as a cure for the underlying cause.
What to tell the veterinarian and what testing may involve
Useful details include when the diarrhea began, how often it occurs, its color and consistency, recent food or environment changes, contact with other animals, possible toxin exposure, and your cat’s medical history. Do not rely on stool appearance alone to identify the cause.
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Your veterinarian may ask you to bring a fresh fecal sample. Depending on the history and examination, the workup may include fecal testing for parasites or infection, bloodwork, radiographs, ultrasound, or other diagnostics. The choice of tests depends on the individual cat’s signs and findings.
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