# How to Tell If Your Small Pet Is Sick: Early Warning Signs Rabbits are prey animals, so they instinctively hide signs of illness until they feel very unwell. By the time a rabbit looks obviously sick, the problem is often advanced and needs urgent care. Knowing how to tell if my rabbit is sick starts with learning what is normal for your rabbit and checking them briefly every day. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - **Not eating or producing fewer droppings** is one of the earliest and most reliable signs of illness in a rabbit. Check the litter box every morning. - **Grinding teeth, sitting hunched, or pressing the belly to the floor** are common signs of pain. Rabbits in pain often stop eating and hide [1]. - **A rectal temperature of 40.0 °C (104 °F) or higher** is linked to a higher risk of death in ill pet rabbits, so fever is a serious finding [2]. - **Weigh your rabbit weekly** and check the litter box daily. Small changes in weight, appetite, or droppings are your best early warning system. - **Call an exotic-animal veterinarian the same day** if your rabbit stops eating, stops pooping, or shows signs of severe pain. Rabbits decline fast once symptoms show. ## What Early Illness Looks Like in a Rabbit ### Normal rabbit behavior and vital signs A healthy rabbit is curious, alert, and eats throughout the day and night. Rabbits are crepuscular, meaning they are most active at dawn and dusk, but they should still nibble hay and produce droppings around the clock. Normal rectal temperature in a rabbit is roughly 38.0 to 39.9 °C (100.4 to 103.8 °F) [2]. A healthy rabbit produces a steady supply of round, firm droppings. They also produce soft cecotropes, which they eat directly from the anus, so you may not see them often. A rabbit that suddenly stops producing droppings, or produces tiny or misshapen ones, is a rabbit in trouble. ### The earliest signs of illness The earliest signs are usually subtle. You might notice your rabbit is quieter than usual, sitting in a corner, or less interested in treats. They may grind their teeth, sit in a hunched posture, or press their abdomen against the floor [1]. These are signs of pain, and they often appear before more obvious symptoms. Other early signs include: - Eating less hay or refusing favorite foods - Drinking more or less water than usual - Dropping weight even though you have not changed the diet - Fur that looks dull, greasy, or unkempt because the rabbit stops grooming - Changes in breathing rate or effort - Head tilt, circling, or loss of balance - Swelling, lumps, or wounds anywhere on the body Because rabbits hide illness so well, quick veterinary care matters when you spot any of these changes [1]. ### A daily health check you can do in two minutes You do not need to handle your rabbit roughly to check them. A quick daily routine catches most problems early. 1. **Watch them eat.** Offer a small piece of hay or a favorite green. A rabbit that ignores food is a concern. 2. **Check the litter box.** Count droppings roughly. Fewer, smaller, or absent droppings mean call your vet. 3. **Look at their posture.** A hunched rabbit with squinted eyes or grinding teeth is likely in pain [1]. 4. **Check the nose and eyes.** Discharge, crusting, or redness is abnormal. 5. **Feel for lumps.** Run your hands gently over the body during petting. Note any new swelling. 6. **Weigh weekly.** Use a kitchen scale. A drop of even a few ounces matters in a small pet. ## Main Causes of Illness in Rabbits Rabbits can develop problems in almost any body system. The table below covers the most common causes and how urgent they are. | Cause | Typical clues | How urgent | |---|---|---| | Gastrointestinal stasis (slow gut) | Not eating, small or no droppings, hunched posture, teeth grinding | Emergency, same day | | Gastric dilatation and volvulus (GDV) | Sudden loss of appetite, lethargy, severe abdominal pain, bloated belly [3] | Emergency, immediately | | Colonic perforation and peritonitis | Apathy, anorexia, low body temperature, fast heart rate, abdominal pain [4] | Emergency, immediately | | Dental disease | Drooling, dropping food, weight loss, eye discharge | Urgent, within 24 hours | | Respiratory infection | Sneezing, nasal discharge, noisy breathing | Urgent, within 24 hours | | Uterine adenocarcinoma | Bloody discharge, palpable mass, weight loss in an unspayed female [5] | Urgent, within days | | Abscess or wound | Swelling, pus, heat, pain at the site | Urgent, within 24 hours | | Fever from infection | Rectal temperature at or above 40.0 °C (104 °F), lethargy, poor appetite [2] | Emergency, same day | Some of these conditions are rare but devastating. Gastric dilatation and volvulus, for example, has only been documented a handful of times in rabbits, but it causes acute loss of appetite, lethargy, and marked abdominal pain, and it needs immediate surgical treatment [3]. Colonic perforation with peritonitis is another rare emergency that can present with apathy, anorexia, hypothermia, and abdominal pain [4]. Reproductive tumors are more common than many owners realize. Uterine adenocarcinoma is the most common tumor in female rabbits, and the risk goes up with age [5]. Spaying a female rabbit removes this risk almost entirely, which is one of the strongest reasons to discuss spaying with your veterinarian. ## Red Flags That Mean an Emergency Some signs mean you should stop reading and call an emergency veterinary hospital right now. - **No droppings for 12 hours or more** - **Complete refusal to eat for more than 12 hours** - **Severe abdominal pain**, such as pressing the belly to the floor, crying out, or refusing to be touched - **Labored breathing** or breathing with the mouth open - **Collapse, seizures, or inability to stand** - **A rectal temperature of 40.0 °C (104 °F) or higher** [2] - **Bloody discharge** from the vulva, rectum, or mouth - **A bloated, hard, or distended abdomen** [3] Rabbits cannot vomit, and their digestive system depends on constant movement of food through the gut. A rabbit that stops eating can go downhill within hours. If you are unsure whether a sign is an emergency, call your veterinarian. It is always better to be told to wait than to wait too long. ## What You Can Safely Do at Home While Waiting While you wait for your appointment, there are a few safe steps you can take. Do not give any medication unless your veterinarian tells you to. Certain antibiotics that are safe for other pets can disrupt a rabbit's normal intestinal bacteria and cause severe diarrhea or death [1]. Never give human pain relievers to a rabbit. Safe steps include: - **Keep your rabbit warm and quiet.** Stress makes pain and illness worse. - **Offer favorite foods.** Try hay, fresh greens, or a small piece of fruit to encourage eating. Do not force-feed unless your vet instructs you. - **Offer fresh water** in a bowl and a bottle, since some rabbits prefer one over the other. - **Do not fast your rabbit.** Unlike dogs and cats, rabbits should not be kept from eating for long periods, even before surgery, because fasting disrupts normal gut movement [1]. - **Note the timeline.** Write down when your rabbit last ate, last pooped, and when you first noticed the change. This helps your vet a lot. - **Call ahead.** Tell the clinic your rabbit is not eating or pooping so they can prepare. If you have other small pets, such as rats, guinea pigs, or hamsters, the same principle applies. Small mammals decline quickly, and early signs are easy to miss. You can read more about [signs of illness in small mammals and when to see a vet](/knowledge/veterinary-medicine/small-mammal-care/small-mammal-illness-signs) to compare what you are seeing across species. ## What Your Veterinarian Will Check and Test Your veterinarian will start with a full physical exam. They will check your rabbit's weight, hydration, teeth, eyes, ears, lungs, heart, and abdomen. They will also take a rectal temperature, since fever is a meaningful clue in ill rabbits [2]. Depending on what they find, they may recommend: - **Blood work** to check organ function, blood cell counts, and signs of infection - **Radiographs (X-rays)** to look for gas, blockages, or masses. In one reported case, X-rays showed free gas in the abdomen and dilated intestines, which pointed to a perforated colon [4]. - **Ultrasound** to look at the abdomen in more detail. Ultrasound can show displacement of the spleen, which supports a diagnosis of gastric dilatation and volvulus [3]. - **Fecal testing** for parasites and bacteria - **Cytology or biopsy** if a lump or mass is found. Diagnosis of tumors often relies on imaging, cytology, and histopathology [5]. Pain management is a core part of rabbit care. Veterinarians commonly use multimodal analgesia, which means combining more than one pain medication, for surgical and painful conditions [6]. If your rabbit is in pain, ask your vet about a pain plan. Do not try to manage pain at home with human medications. If your rabbit needs surgery, expect them to start eating again soon after they wake up. Hay and water are usually offered soon after a rabbit is awake, and appetite may improve with alfalfa hay or small fruit treats. Pain medicine is often used for 1 to 2 days after surgery to help keep them eating normally [1]. ## Prevention and Daily Monitoring The best way to catch illness early is to know your rabbit's normal. Weigh them weekly, watch their appetite daily, and check the litter box every morning. Small changes are your early warning system. Other prevention steps: - **Feed a hay-based diet.** Unlimited grass hay supports gut health and wears down teeth. - **Spay female rabbits.** Uterine adenocarcinoma is the most common tumor in female rabbits and becomes more common with age [5]. - **Keep the environment clean.** Dirty bedding and poor ventilation raise the risk of respiratory and skin problems. - **Schedule annual wellness exams** with an exotic-animal veterinarian, even when your rabbit seems fine. - **Quarantine new rabbits** for at least two weeks before introducing them to your current pets. - **Watch for pain signs** after any surgery or injury. Food intake and behavior are the most commonly used indicators of pain in rabbits [6]. If you also have a dog at home, some of the same monitoring habits apply, though the diseases differ. You can compare how fever and parasites show up in dogs by reading [how to tell if a dog has a fever](/knowledge/veterinary-medicine/clinical-methods/how-to-tell-if-dog-has-fever) or [how do I know if my dog has worms](/knowledge/veterinary-medicine/parasitic-diseases/how-do-i-know-if-my-dog-has-worm). ## Limitations and When to Contact a Veterinarian This article gives general guidance, but every rabbit is an individual. Only a veterinarian who examines your rabbit can diagnose and treat illness. **Call an emergency veterinary hospital now if your rabbit:** - Has not eaten or pooped for 12 hours or more - Is breathing with an open mouth or struggling to breathe - Has collapsed, is having seizures, or cannot stand - Has a hard, bloated, or painful abdomen - Has a rectal temperature of 40.0 °C (104 °F) or higher [2] **Call your regular veterinarian the same day if your rabbit:** - Is eating less than usual or producing fewer droppings - Is grinding teeth, hunched, or hiding more than usual [1] - Has discharge from the eyes, nose, or vulva - Has a new lump, wound, or swelling - Has lost weight since the last check **Schedule a routine visit if your rabbit:** - Is due for a wellness exam or spay - Has minor changes in grooming or activity that have lasted more than a day or two - Has a history of dental problems and needs a recheck ## Frequently Asked Questions ### How long can a rabbit go without eating before it is an emergency? A rabbit that has not eaten for 12 hours needs urgent veterinary care. Rabbits cannot vomit and their gut depends on constant movement of food, so a pause in eating can quickly become a life-threatening gut slowdown [1]. Do not wait to see if your rabbit eats on its own. ### Is my rat sick if it is sneezing and has red discharge around the nose? Red discharge around a rat's nose and eyes is usually porphyrin, a pigment in tears and saliva, and it often increases with stress or illness. Sneezing with discharge can point to a respiratory infection, which is common in rats and can worsen quickly. See an exotic veterinarian promptly if you notice this. ### What are the first signs of illness in a guinea pig? Guinea pigs often show subtle signs first, such as eating less, hiding more, or producing fewer droppings. Weight loss, rough fur, and reluctance to move are also early clues. Weigh your guinea pig weekly, since small mammals hide illness until it is advanced. ### How can I tell if my hamster is sick? A sick hamster may be less active, sleep more, stop hoarding food, or have a wet or dirty tail area. They may also lose weight or develop labored breathing. Because hamsters are small and decline fast, contact an exotic veterinarian the same day you notice a change. ### Can I give my rabbit human pain medication? No. Never give human pain relievers to a rabbit without veterinary direction. Some medications that are safe for other pets can cause severe diarrhea or death in rabbits, and only a veterinarian can calculate a safe dose based on your rabbit's weight and health [1]. ## Related Articles - [Signs of Illness in Small Mammals and When to See a Vet](/knowledge/veterinary-medicine/small-mammal-care/small-mammal-illness-signs) - [How to Tell If Your Rabbit Is in Pain and Help It](/knowledge/veterinary-medicine/small-mammal-care/rabbit-pain-signs-and-relief) - [How to Tell If Your Small Pet Is Dying: Signs to Watch](/knowledge/veterinary-medicine/small-mammal-care/signs-small-pet-dying) ## References 1. [Illness of Rabbits - All Other Pets](https://www.merckvetmanual.com/all-other-pets/rabbits/illness-of-rabbits). Merck Veterinary Manual. 2. [Increased rectal temperature is associated with poor prognosis and infectious diagnoses in clinically ill pet rabbits](https://pubmed.ncbi.nlm.nih.gov/41985519/). Journal of the American Veterinary Medical Association, 2026. 3. [Gastric dilatation and volvulus in a 5-year-old intact female Holland lop rabbit](https://pubmed.ncbi.nlm.nih.gov/41142972/). The Canadian veterinary journal = La revue veterinaire canadienne, 2025. 4. [Pneumoperitoneum Secondary to Colonic Perforation in a Domestic Rabbit](https://pubmed.ncbi.nlm.nih.gov/41594389/). Animals : an open access journal from MDPI, 2026. 5. [Recent Advances in Rabbit Oncology: Diseases, Diagnosis](https://pubmed.ncbi.nlm.nih.gov/41708454/). The veterinary clinics of North America. Exotic animal practice, 2026. 6. [Survey of German veterinarians' approaches to pain assessment and management of perioperative pain in pet rabbits](https://pubmed.ncbi.nlm.nih.gov/41342384/). The Veterinary record, 2026. ## Further Reading - [American Veterinary Medical Association: First Aid Tips for Pet Owners](https://www.avma.org/resources-tools/pet-owners/emergencycare/first-aid-tips-pet-owners) - [Merck Veterinary Manual: Rabbits](https://www.merckvetmanual.com/all-other-pets/rabbits)