Rabbit with diarrhoea: when it becomes an emergency

With most symptoms I say: watch first. With a rabbit that has real, watery diarrhoea I say the opposite — here every hour counts. Why that is, how to tell real diarrhoea from soft droppings and from perfectly normal caecotrophs, and when it must not wait until tomorrow.

First things first: real diarrhoea is an emergency

For once I start this subject at the end, because not knowing it costs too much: if a rabbit has real, watery diarrhoea and has stopped eating, this is no case for reading up but one for the emergency service — today, not tomorrow.

The reason is size. A rabbit weighs one or two kilos. With liquid faeces such a small body loses so much fluid within a few hours that it dehydrates — and dehydration is what kills in the end, not the diarrhoea itself. If signs such as teeth grinding, apathy, a bloated belly or cold ears and paws come with it, that is a picture of shock. Then there is no more waiting and no more trying things out.

Everything else here helps you judge the situation and recognise earlier what is building up. But watery diarrhoea in a rabbit that is not eating stands above all of it — no text sorts that out, only a veterinary practice does.

Three things that are constantly confused

In rabbits “diarrhoea” is a catch-all for three quite different things — and the confusion causes mistakes in both directions: some people panic over something entirely normal, others sit out a real emergency. So here is the distinction first.

• Caecotrophs — entirely normal. Soft, shiny, grape-like clusters with a slightly mucous coating, often rather strong-smelling. Rabbits normally take them straight from the anus again, because they contain valuable nutrients. This is not diarrhoea but healthy digestion. You only see it when the animal exceptionally leaves it lying.
• Soft droppings — a warning sign, but not an acute emergency. A pasty, mushy mass that sticks to the rear end and smells distinctly sweet and fermented. Soft droppings are really altered caecotrophs — a sign that the gut flora is out of balance, almost always because of the diet. It needs checking, and so does the feeding, but it is not the same ticking-clock situation as the next point.
• Real diarrhoea — the emergency. Liquid or mushy faeces, and above all: no normal pellets any more. If no firm, round pellets appear among the mush any more, it is real diarrhoea. In young rabbits especially, this moves terrifyingly fast.

The simplest rule of thumb at home: as long as normal, firm pellets are there among it, this is more of a flora and feeding question. Once the firm pellets have vanished entirely and everything is liquid, it is the emergency.

Why it happens so fast in rabbits

Rabbits are continuous eaters. Their digestive system is built on a constant supply — the gut does not push strongly under its own power but is pushed along from behind by new food. If eating stops, the whole machinery slows down, and in the worst case it comes to a halt. I describe this gut stasis in detail in rabbit not eating — and it is closely connected with diarrhoea.

Because diarrhoea and not eating reinforce each other. The diarrhoea takes fluid out of the body and makes the animal miserable, the miserable animal stops eating, and without food digestion falters — a downward spiral that becomes dangerous in hours in such a small animal, not in days. That is why the combination of diarrhoea and loss of appetite is the clearest alarm signal there is.

The most common causes

In the vast majority of cases it is the food. A rabbit’s gut is built for fibre-rich, sparse fare — hay, meadow, herbs. What throws it off:

• Too much grain, bread, pellets and seed mixes. These “treats” deliver starch and sugar the gut cannot handle.
• Too much fruit and sugary vegetables such as carrot — well meant, but in quantity a killer of gut flora.
• Changing the food too quickly. New greens or a new variety need introducing slowly, not overnight.
• Coccidia — tiny gut parasites that strike above all in young rabbits and recently rehomed animals. That is why diarrhoea in a young rabbit is always especially serious.
• Other triggers: worms, yeasts, a course of antibiotics, dental problems that interfere with eating, or simply stress.

For you at home this does not mean you have to find the cause yourself. It means: what you feed is the most important piece of information for the practice — and often the first lever that can be turned.

What you can do until the appointment — and what you must not

Between your phone call and the appointment there are a few things that genuinely help — and a few well-meant ones that do harm.

This helps:

• Offer hay and secure water. Even if it sounds contradictory with diarrhoea: the gut has to keep running, and fibre is the best thing for that. Fresh water against dehydration.
• Collect a faecal sample, ideally from two or three days. With that the practice can test specifically for coccidia, worms and yeasts instead of guessing.
• Keep the rear end clean and dry. Matted, damp fur at the rear attracts flies in summer — their maggots are a very serious danger in their own right.
• Keep it warm and quiet. A weakened rabbit cools down quickly.

This does harm:

• Taking the food away. With dogs and cats one sometimes fasts an animal with diarrhoea — in rabbits that is dangerous. A rabbit that does not eat risks gut stasis. Hay always stays there.
• Human anti-diarrhoeal medicines. Preparations from your medicine cupboard are not meant for rabbits and can do more damage than good.
• “Home remedies” such as yoghurt or milk. Rabbits are strict herbivores; dairy has no business in their gut.
• Giving antibiotics yourself, for instance leftovers from an earlier treatment. Some antibiotics are in fact highly dangerous for rabbits.

When it must not wait until tomorrow

For safety, the signs where you do not wait for a regular appointment but call the emergency service:

• watery, genuinely liquid diarrhoea, no firm pellets left
• the rabbit is not eating and not drinking
• it sits apathetically, barely reacts, grinds its teeth (a sign of pain)
• cold ears and paws, pale mucous membranes — these are signs of shock
• a bloated, hard belly
• any young rabbit with diarrhoea — here the window is especially short

For everything else — soft droppings once, a slightly softer pellet, an otherwise bright, eating animal — the rule is: check the feeding, watch, and if it does not clearly improve within a day, make an appointment. That should not be sat out for days either.

Why I wrote this article

Because I too often see rabbits that arrive a day too late. Not because their owners were careless — on the contrary, they waited because they did not want to “make it worse”, or because the internet said to change the diet first and wait.

With many animals waiting is a sensible first step. With a rabbit that has real diarrhoea it is the most expensive one. I want you to know the difference between soft droppings and an emergency before you first see it in your own animal — then you make the right decision at the decisive moment, and here that often means: call now.