Blood in stool is never normal, even if your cat eats and plays as usual. Bright red drops or streaks (hematochezia) usually come from the colon or rectum—stress, parasites, or sudden diet change are frequent causes. Black, tarry stool (melena) can signal digested blood higher in the tract and needs faster veterinary attention.
Key Points
- Fresh red blood on formed stool often reflects colitis, constipation straining, or parasites like hookworm—common after boarding or new food.
- Tarry black stool suggests bleeding in the stomach or small intestine; treat as urgent if paired with pale gums or weakness.
- A single speck after one hard stool may resolve with hydration and fiber—but repeat bleeding within 72 hours deserves a fecal test and exam.
- Outdoor hunters may pass rodent bone fragments that scrape the colon; indoor cats on dry-only diets may develop constipation-related bleeding.
- Bring a fresh stool sample (less than 12 hours old, refrigerated) to the vet—photos help but cannot replace parasite screening.
Practical Tips
- Photograph the stool next to a coin for scale, then bag a walnut-sized sample for the clinic.
- List every food, treat, and medication from the past 14 days—including new litter or stressors like visitors.
- Do not give human anti-diarrhea medicine; some ingredients (like loperamide) are unsafe for cats.
This article is for general educational purposes only and does not replace professional veterinary advice. Contact your vet if your pet shows ongoing symptoms.