# Blood in Kitten Poop: Causes and When to Worry Is it normal for kittens to have blood in their poop? No, blood in kitten poop is not normal, though it is common and often treatable. A small streak of bright red blood on the outside of a firm stool can come from irritation near the anus, while larger amounts, dark tarry stool, or blood mixed with diarrhea point to a problem higher up or a more serious illness. Because kittens dehydrate and weaken quickly, any blood in the stool deserves a call to your veterinarian. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Blood in kitten poop is never expected, but the most common causes in young cats are intestinal parasites and colitis (inflammation of the colon). - Bright red blood usually means bleeding near the end of the bowel, such as the colon, rectum, or anus. Dark, tarry stool suggests bleeding higher up. - A single small streak on an otherwise playful, eating, drinking kitten is less alarming than blood plus vomiting, lethargy, or repeated diarrhea. - Bring a fresh stool sample to the vet visit. Parasites are a leading cause and are found by examining the stool. - Call your vet the same day for any blood. Go to an emergency clinic now if your kitten is weak, pale, vomiting, not eating, or passing large amounts of blood. ## What Blood in Kitten Poop Looks Like Owners describe several patterns, and the pattern helps your vet narrow down the cause. **Bright red streaks or drops.** This is fresh blood, called hematochezia. It often coats the surface of the stool or appears on the fur around the anus. It usually comes from the lower bowel. **Blood mixed into diarrhea.** The stool may look jelly-like, mucusy, or pink-tinged. This points to inflammation in the colon. **Dark, tarry stool.** Black, sticky stool that looks like tar is called melena. It means blood was digested higher in the gastrointestinal tract. This is a more serious sign. **Blood only on the tissue or in the litter.** Sometimes you see red on a wipe or in the litter box without obvious blood in the stool itself. A normal kitten stool is firm, brown, and log-shaped. It should not contain visible blood, large amounts of mucus, or a watery consistency. If your kitten also has loose stool with a jelly-like coating, see our guide to cat diarrhea with mucus. ## Why Does My Kitten Have Blood in His Poop? There are many possible reasons, and several are far more likely in kittens than in adult cats. Kittens have immature immune systems, are often still finishing vaccine series, and may have recently come from a shelter, breeder, or outdoor setting where parasites spread easily. ### Common Causes of Blood in Kitten Stool | Cause | Typical clues | How urgent | |---|---|---| | Intestinal parasites (coccidia, Giardia, hookworms, roundworms) | Diarrhea, poor weight gain, potbelly, blood or mucus in stool | Same-day vet visit | | Infectious colitis (bacteria, protozoa, other agents) | Large bowel diarrhea, straining, urgency, sometimes systemic illness | Same-day vet visit | | Stress or diet change colitis | Blood and mucus with a recent food switch, new home, or travel | Routine visit within a day or two | | Foreign body or toxin | Vomiting, pain, not eating, blood in stool | Emergency now | | Rectal polyp or growth | Straining, blood on stool surface, tissue protruding from anus | Routine visit, not usually an emergency | | Bleeding disorder (coagulopathy) | Blood in stool plus bruising, pale gums, bleeding elsewhere | Emergency now | | Severe infections (fungal, algal, unusual organisms) | Chronic diarrhea that does not respond to usual treatment | Urgent, needs specialist testing | ### Parasites Parasites are one of the top reasons a kitten has blood in his poop. In a study of young dogs and cats with diarrhea, 33.9 percent of the cats tested positive for coccidia, with Cystoisospora felis found in 28 percent and Cystoisospora rivolta in 5.1 percent [1]. Watery or bloody diarrhea was seen in some of those infected cats, including 19 percent of those with C. felis and 40 percent with C. rivolta [1]. Other parasites found in that group included Giardia, hookworms, roundworms, and tapeworms [1]. Parasites are common in kittens overall. A large survey of dogs and cats found intestinal parasites in a high proportion of animals, with Giardia the most frequently detected organism, followed by hookworms, Cystoisospora, and roundworms [2]. Many of these parasites can pass to people, which is one more reason to treat them promptly. ### Infectious Colitis Colitis means inflammation of the colon. When an infection causes it, the result is often large intestinal diarrhea, which means frequent small stools, straining, urgency, and blood or mucus. Causative agents include bacteria, protozoa, helminths, trematodes, fungi, oomycetes, and algae, and which one is involved depends on the kitten's age, immune status, and environment [3]. Parasites such as Trichuris vulpis and Tritrichomonas blagburni are common and should be screened for routinely [3]. For bacterial colitis, treatment focuses on supportive care and fixing the underlying problem instead of reaching for antibiotics by default [3]. Some infections, such as those tied to Escherichia coli, need a tissue diagnosis and antibiotics chosen by susceptibility testing [3]. Disseminated fungal, oomycete, and algal infections often need long, multi-drug treatment [3]. The outcome depends on the specific organism and whether it has spread beyond the gut [3]. ### Unusual Infections Rare organisms can cause long-lasting bloody diarrhea in young cats. One report described a 1-year-old cat with chronic large bowel diarrhea that did not improve with several antibiotics, prednisolone, or dietary supplements [4]. Endoscopy showed an irregular colonic lining with erosions and bleeding, and testing identified a Prototheca bovis infection causing granulomatous colitis [4]. This kind of case is uncommon, but it shows why diarrhea that keeps coming back needs a deeper workup. ### Rectal Polyps and Growths Growths called rectal polyps occur infrequently in cats [5]. They are usually benign and do not spread [5]. Signs include straining to defecate, blood in the feces, and diarrhea [5]. A veterinarian can often feel the polyp during a rectal exam, and its surface tends to bleed easily [5]. Sometimes the polyp protrudes from the anus [5]. Surgical removal is usually followed by rapid recovery and a long survival time, and tissue may be sent to a lab to confirm the diagnosis [5]. ### Bleeding Disorders Problems with blood clotting can also cause blood in the stool. One report described a 3-year-old cat with a systemic coagulopathy in which an ultrasound finding appeared before the cat developed hematochezia and anemia [6]. The cat recovered quickly after treatment with plasma, a whole blood transfusion, and vitamin K [6]. This is a reminder that bleeding in the stool is not always a gut problem. If your kitten has blood in the stool along with bruising, nosebleeds, or pale gums, that is an emergency. ## Red Flags That Mean Emergency Care Now Some signs mean you should not wait for a regular appointment. - Your kitten is weak, limp, or hard to wake. - Gums look pale, white, or blue. - Breathing is fast or labored. - There is a large amount of blood, or the stool is mostly blood. - Stool is black and tarry. - Your kitten is vomiting repeatedly or cannot keep water down. - Your kitten has not eaten for more than 12 hours. - You suspect your kitten ate a foreign object, human medication, or a toxic plant. - Your kitten is crying in pain or has a swollen, painful belly. Kittens have small bodies and little reserve. Blood loss, dehydration, and infection can turn serious fast. When in doubt, call an emergency clinic and describe what you see. ## What You Can Safely Do at Home While You Wait You cannot treat blood in the stool at home, but you can keep your kitten stable and give your vet better information. **Collect a fresh stool sample.** Place a walnut-sized piece of fresh stool in a clean plastic bag or container. Refrigerate it if you cannot bring it within a few hours. Do not freeze it. Parasite testing depends on a fresh sample. **Keep your kitten hydrated.** Offer fresh water often. If your kitten is nursing, keep the mother and littermates together unless your vet says otherwise. Do not force fluids by mouth. **Do not give human medications.** Never give ibuprofen, acetaminophen, aspirin, or human anti-diarrheal drugs to a kitten. These can be fatal. Your veterinarian calculates any medication dose from your kitten's weight and health. **Do not change the diet suddenly.** Sudden food switches can worsen colitis. If your kitten is already on a food that works, keep it the same until your vet advises otherwise. **Separate your kitten from other pets if diarrhea is ongoing.** Many intestinal parasites and some infections spread through shared litter boxes and grooming. **Take photos.** A picture of the stool, the litter box, and your kitten's overall posture helps your vet judge severity. **Watch the whole kitten, not just the stool.** Energy level, appetite, drinking, urination, and play behavior matter as much as the blood itself. If your kitten also has urinary signs, such as straining or blood in urine, see [cat blood in urine but acting normal](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-blood-urine-acting-normal) and [why is my cat having blood in urine](/knowledge/veterinary-medicine/symptom-guides/why-is-my-cat-having-blood-in-urine-uti-and-bladder-stones-diagnosis). ## What Your Veterinarian Will Check and Test Your vet will start with a full history and physical exam. Expect questions about diet, recent changes, vaccine status, deworming history, other pets, and whether your kitten goes outside. **Physical exam.** Your vet will check hydration, gum color, belly palpation, temperature, and weight. A rectal exam can detect a polyp or other growth near the anus [5]. **Fecal testing.** Stool flotation, concentration, and other tests look for coccidia, Giardia, worm eggs, and other parasites [1][2]. Some organisms need special stains or PCR testing. **Blood work.** A complete blood count and chemistry panel check for anemia, infection, organ function, and dehydration. **Imaging.** X-rays or ultrasound may be needed if a foreign body, mass, or bleeding disorder is suspected. **Endoscopy and biopsy.** If diarrhea is chronic and other tests are unrewarding, your vet may recommend endoscopy to look directly at the colon lining and take tissue samples [4]. This is how conditions like granulomatous colitis are diagnosed [4]. **Coagulation testing.** If bleeding seems out of proportion to the gut findings, your vet may test how well your kitten's blood clots [6]. Treatment depends on the cause. Dewormers and antiparasitic drugs handle parasites. Supportive care with fluids, a bland or prescription diet, and probiotics helps colitis. Some infections need specific antimicrobials chosen after testing [3]. Polyps are removed surgically [5]. ## Prevention and Monitoring You cannot prevent every cause, but you can lower the risk. - Keep your kitten indoors and away from unknown cats until vaccines and deworming are complete. - Follow your vet's deworming schedule. Kittens need repeated treatments because parasites have life cycles. - Scoop the litter box daily and wash it weekly. - Wash your hands after handling stool, and teach children to do the same. Some kitten parasites can infect people [2]. - Feed a consistent, high-quality kitten diet and make food changes slowly. - Keep up with wellness visits so weight gain and stool quality are tracked. - Watch for repeat episodes. Diarrhea that keeps coming back after treatment needs a deeper look, including possible endoscopy [4]. ## Limitations and When to Contact a Veterinarian This article covers common patterns, but every kitten is an individual. Only your veterinarian can examine your kitten, test the stool, and set a treatment plan. Call your veterinarian the same day if you see any blood in the stool, even a small streak, or if your kitten has diarrhea lasting more than 24 hours, is losing weight, or has a poor appetite. Go to an emergency clinic now if your kitten is weak, collapsed, pale, breathing hard, vomiting repeatedly, passing large amounts of blood, or passing black tarry stool. Schedule a routine visit soon if the blood was a one-time small streak and your kitten is otherwise bright, eating, and playing normally. Bring a fresh stool sample to that visit. ## Frequently Asked Questions ### Should I panic if I see one drop of blood on my kitten's stool? No, a single small drop is not usually an emergency, but it still needs a vet visit. Bright red blood on a firm stool often comes from minor irritation near the anus. Call your vet, describe what you saw, and bring a stool sample so parasites can be ruled out. ### Can food cause blood in my kitten's poop? Yes, a sudden diet change or food intolerance can inflame the colon and cause blood or mucus. The fix is usually to return to the previous food and let your vet guide any transition. If blood continues after the diet is stable, other causes need testing. ### How long does bloody diarrhea last in kittens? It depends on the cause. Parasite-related diarrhea often improves within days of starting the right treatment, while chronic colitis can take weeks. Diarrhea lasting more than 24 hours in a kitten warrants a vet visit because dehydration happens quickly. ### Can my other pets or my family catch what my kitten has? Some causes can spread, including several intestinal parasites. Giardia and roundworms are among the organisms that can pass between animals and, in some cases, to people [2]. Wash your hands after cleaning the litter box, and ask your vet whether other pets need testing or treatment. ### Will my kitten need antibiotics for blood in the stool? Not always. Many cases are caused by parasites, diet, or stress, which do not respond to antibiotics. For bacterial colitis, current guidance favors supportive care and treating the underlying cause instead of routine antimicrobials [3]. Your vet will decide based on test results. ## Related Articles - [Cat Blood in Urine but Acting Normal: Causes and Next Steps](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-blood-urine-acting-normal) - [Why Is My Cat having blood in urine? UTI and Bladder Stones Diagnosis](/knowledge/veterinary-medicine/symptom-guides/why-is-my-cat-having-blood-in-urine-uti-and-bladder-stones-diagnosis) - [Cat Blood in Urine: Causes and When to Rush to the Vet](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-blood-in-urine-causes-when-to-rush) - [Cat Diarrhea with Mucus: Causes and When to Worry](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-diarrhea-with-mucus-causes-when-to-worry) - [Why Is My Cat Peeing blood? Cystitis, Infection & Stones](/knowledge/veterinary-medicine/symptom-guides/why-is-my-cat-peeing-blood-cystitis-infection-stones) - [Cat Diarrhea with Blood and Mucus: Causes and When to Act Fast](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-diarrhea-blood-mucus-causes) - [Blood in Cat Poop: Causes, Urgency, and What to Do](/knowledge/veterinary-medicine/digestive-and-urinary-care/blood-in-cat-poop) - [Cat Pooping Blood: Causes and What to Do Next](/knowledge/veterinary-medicine/digestive-and-urinary-care/cat-pooping-blood-causes) - [Kitten Not Pooping: Causes and When to Help](/knowledge/veterinary-medicine/digestive-and-urinary-care/kitten-not-pooping) ## References 1. [Occurrence of Cystoisospora spp. and other intestinal parasites in dogs and cats with diarrhea](https://pubmed.ncbi.nlm.nih.gov/40690864/). Veterinary parasitology, 2025. 2. [Beyond the clinical eye: mapping intestinal parasitic infections and its risk factors among dogs and cats across Portugal](https://pubmed.ncbi.nlm.nih.gov/42459543/). Frontiers in veterinary science, 2026. 3. [Infectious Colitis in Dogs and Cats: Diagnosis, Management, and Clinical Outcomes](https://pubmed.ncbi.nlm.nih.gov/41876338/). The Veterinary clinics of North America. Small animal practice, 2026. 4. [Granulomatous colitis associated with Prototheca bovis infection in a young cat](https://pubmed.ncbi.nlm.nih.gov/40718031/). JFMS open reports, 2025. 5. [Disorders of the Rectum and Anus in Cats - Cat Owners](https://www.merckvetmanual.com/cat-owners/digestive-disorders-of-cats/disorders-of-the-rectum-and-anus-in-cats). Merck Veterinary Manual. 6. [Hyperechoic Retroperitoneal Fat in a Cat with Systemic Coagulopathy](https://pubmed.ncbi.nlm.nih.gov/41190686/). Journal of the American Animal Hospital Association, 2025. ## Further Reading - [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners) - [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)