uneaten cecotropes in rabbits: what they are + what to do
This article expands on our original thoughts on uneaten cecotropes from 2022.
Finding a cluster of soft, grape-like droppings under your rabbit - ones they did not eat - can be alarming if you do not know what you are looking at. Uneaten cecotropes are one of the most common things rabbit owners mention to us at BCB, and one of the most misunderstood. Here is what is actually happening, why it matters, and what to do about it.
What Cecotropes Are
Cecotropes are not regular droppings. They are a distinct type of output produced in the cecum - the large fermentation chamber where beneficial bacteria break down fiber into nutrients the body cannot absorb any other way. Cecotropes are the first pass of digestion: nutrient-dense, packed with protein, B vitamins, volatile fatty acids, and beneficial bacteria - meant to be consumed directly from the nethers before they ever touch the ground.
This is normal rabbit behavior. It is not unsanitary. It is biology - and super essential. Research published in 2024 confirmed that cecotrophy is crucial for the development of gut immunity in rabbits and directly affects survival when disrupted. A rabbit who is not consuming their cecotropes is missing a significant portion of their nutritional intake, regardless of what else they are eating.
What They Look Like
Cecotropes are soft, dark, and clustered; they look like a small bunch of grapes with a distinct, strong scent. They are significantly softer and more pungent than regular fecal pellets. Most rabbit parents never see them because healthy rabbits consume them directly from their nethers, often in the early morning hours. If you are finding them on the floor of the enclosure, something has disrupted the normal process.
Why Rabbits Leave Cecotropes Uneaten
Too Rich Diet
This is the most common cause. A rabbit whose diet is heavy in pellets, greens, treats, or fruit is often simply too full of calorie-dense food to be motivated to consume cecotropes. The cecotropes may also change in consistency when the diet is too rich relative to hay intake - becoming softer, mushier, or less palatable.
The fix here is dietary adjustment, not medication. Strip the diet back to basics: unlimited hay, water, and nothing else temporarily. Reintroduce greens, pellets, and treats gradually over about a week and observe whether cecotrope production and consumption normalize. Every rabbit has a different microbiome and a different threshold - what causes cecotrope issues in one rabbit may be completely fine in another.
Medications Changing Texture and Taste
Antibiotics are one of the most common medication-related triggers. They change the gut microbiome, which directly affects the composition, texture, and taste of cecotropes. Your rabbit on antibiotics may find their cecotropes genuinely gross - the good bacteria that make cecotropes nutritionally valuable and worth eating to your rabbit have been disrupted. This is typically temporary and resolves once the medication course is complete and the gut microbiome rebalances.
Other medications can have similar effects. If uneaten cecotropes appear alongside a new medication and resolve after the course ends, the connection is likely. In these cases, adding a rabbit-safe probiotic under veterinary guidance can help support microbiome recovery. Do not add probiotics without speaking to your vet first! Not all probiotic formulations are appropriate for rabbits.
Something Else Healthwise
Uneaten cecotropes can be mistaken for malformed droppings - and vice versa. If what you are finding does not match the grape-cluster description above, it may not be cecotropes at all. Misshapen, small, or strung-together fecal pellets are a separate concern that may indicate GI stasis, dehydration, or dental pain.
Uneaten cecotropes can also be a sign that something else is wrong - pain, illness, obesity, or musculoskeletal issues that prevent the rabbit from reaching their nethers to consume them. A rabbit who is arthritic, overweight, or in pain may physically be unable to perform cecotrophy even if they want to. This requires veterinary assessment, not dietary adjustment.
Why It Matters: The Ceco Cap
Uneaten cecotropes left in your rabbit’s area are a hygiene issue, but uneaten cecotropes that stay on your rabbit's body become a welfare issue.
When cecotropes are not eaten and instead dry onto the fur around the rabbit's hindquarters, they harden into a dense, matted mass the Bun Chia Burrow has coined a “ceco cap”. The texture is similar to human baby cradle cap - a thick, hardened buildup that sticks to the fur and skin. Ceco caps are uncomfortable, can cause skin irritation underneath (resulting in skin infections or urine scald if your rabbit becomes immobile), and most critically, place your rabbit at significant risk for fly strike - a life-threatening condition where flies lay eggs in soiled or matted fur and the resulting maggots begin consuming living tissue.
Fly strike risk is highest in warm months, but can occur year-round in indoor environments with fly exposure. A rabbit with a ceco cap requires immediate grooming attention. If the buildup is significant or the skin underneath appears irritated or compromised, contact your exotic vet.
What To Do
Step 1: Identify the Cause
Is there a new medication? Has the diet recently changed? Is your rabbit able to physically reach their nethers? Is the cecotrope the problem, or is something else going on with their droppings? Start with observation before intervention.
Step 2: Strip the Diet Back to Basics(Vet Guidance)
If diet is the suspected cause, remove greens, pellets, fruit, and treats entirely. Temporarily switch to hay and water only (please do this under guidance of your vet). Observe whether cecotrope production and consumption normalize over about a week. Reintroduce foods gradually, one at a time, to identify the trigger.
Step 3: Consider Probiotics (Vet Guidance)
If the cause appears to be antibiotic disruption or general microbiome imbalance, a rabbit-safe probiotic may help support recovery. This is a conversation to have with your exotic vet, not a home remedy to implement without guidance.
Step 4: Address the Ceco Cap
If cecotropes have started to increase on your rabbit's body, they need to be removed. Warm water and gentle cleaning is the starting point - do not pull or cut at hardened material without softening it first. If the skin underneath is scalded or infected, contact your vet before attempting home grooming.
Step 5: Go to the Vet if Nothing Changes
If uneaten cecotropes continue after about a week of dietary adjustment, probiotic support, and the completion of any medication courses - go to your exotic vet. Persistent cecotrope issues may be caused by underlying GI disease, dental problems, pain, or other conditions that require clinical assessment. Do not continue to manage at home indefinitely without professional guidance.
When To Call Your Vet
Uneaten cecotropes persist beyond about a week of dietary adjustment
You notice significant ceco cap buildup with skin involvement
Your rabbit has stopped eating or defecating alongside the cecotrope issue
You cannot identify a clear dietary or medication-related cause
Your rabbit appears to be in pain or is reluctant to move
See our LA + OC Exotic Vet Directory → for rabbit-savvy exotic vets in Southern California.
Sources:
Carabaño R et al. — New Concepts and Objectives for the Protein-Amino Acid Nutrition in Rabbits. World Rabbit Science, 2009. — cecotrope composition, nutritional role, and factors affecting cecotrophy
Cauquil L et al. — Coprophagia in Early Life Is Crucial for the Maturation of Intestinal Immunity in Rabbits. ISME Journal, 2024. — cecotrophy essential for gut immunity and survival; disruption leads to nutritional deficiency
Forsythe P, Bienenstock J — Immunomodulation by Commensal and Probiotic Bacteria. Immunological Investigations, 2010. — gut microbiome disruption from antibiotics and probiotic recovery