If you have a cat with IBD, you probably already know that feeding them can feel like solving a puzzle where somebody keeps changing the pieces.
One food works beautifully for weeks, then suddenly it doesn't. Your cat vomits. Their stools change. You introduce something that should be perfect on paper and they take one sniff and walk away.
IBD can be frustrating, complicated and very individual. I also understand it from the other side of the counter. My own cat Ava has IBD, so when I say these cats can keep you guessing, I mean it.
The good news is that diet plays a very important role in managing chronic gastrointestinal disease in cats. The trick is working out what your cat tolerates, rather than looking for one magical IBD diet that works for every cat.
What actually is feline IBD?
Inflammatory bowel disease describes chronic inflammation within the gastrointestinal tract. Inflammatory cells infiltrate the walls of the stomach and/or intestines, interfering with normal digestion and nutrient absorption. The exact cause is rarely known. Current evidence points to a complex interaction between the immune system, diet, intestinal bacteria and other environmental factors.
You may also hear your vet use the term chronic enteropathy. That distinction matters because chronic vomiting or diarrhoea does not automatically mean biopsy-confirmed IBD. Veterinarians will typically investigate other possibilities and assess your cat's response to treatment and dietary trials as part of the process.
What does it look like?
Common signs include chronic or intermittent vomiting, diarrhoea, changes in appetite, weight loss, abdominal discomfort and changes in stool consistency. Symptoms may come and go, which is part of why these cats are so difficult to figure out.
We sometimes still hear that vomiting regularly is just what cats do. It isn't something I would dismiss, particularly when it is happening repeatedly or alongside other signs.
Getting a proper diagnosis
IBD is not something that can be reliably diagnosed from symptoms alone. Vomiting, diarrhoea and weight loss can occur with parasites, pancreatitis, hyperthyroidism, kidney disease, liver disease and gastrointestinal cancers including lymphoma. This is why a proper veterinary workup matters, and why having a vet who is comfortable managing chronic gastrointestinal disease is so valuable. For complicated cases, an internal medicine specialist can be worth their weight in gold.
Your vet will typically work through the following steps:
01 Routine Bloodwork and Urinalysis
A complete blood count, biochemistry profile, and urinalysis help rule out other conditions with similar presentations, including kidney disease, elevated thyroid levels, and liver disease. Results are often normal in IBD cats, though some show anaemia, elevated white cell counts, or abnormal protein and liver enzyme levels.
02 Fecal Analysis (PCR)
Rules out parasitic or bacterial causes of GI inflammation before IBD is considered further.
03 IDEXX GI Panel
This specific blood panel tests B12 (cobalamin), folate, Spec fPL, and TLI. It is particularly valuable because it can implicate or rule out pancreatic involvement and identify B12 deficiency, which is extremely common in cats with chronic gut inflammation. B12 deficiency on its own can drive ongoing diarrhoea, and failing to identify and correct it can delay recovery even when the underlying IBD is being treated appropriately. If your cat has not had a GI panel including cobalamin, ask for one.
04 Abdominal Ultrasound
Rules out pancreatitis, cancer, and other conditions not visible in bloodwork. Ultrasound can also assess intestinal wall thickness, which is often significantly elevated in IBD cats, though it cannot definitively diagnose IBD on its own.
05 Biopsy (Endoscopic or Surgical)
The only way to definitively confirm IBD and distinguish it from gastrointestinal lymphoma, which presents almost identically. Endoscopic biopsy is less invasive and your cat can often go home the same day. Surgical biopsy is the gold standard, taking a full-thickness section of the intestinal wall, but requires a hospital stay and carries more risk. My own position is that it is worth trialling dietary and pharmacological management first if your cat is stable enough to do so. That said, this is always your decision, made in consultation with a vet you trust.
So where does food come into this?
For some cats with chronic gastrointestinal disease, changing the diet makes a substantial difference. Veterinary guidelines commonly recommend dietary trials using a novel protein when food responsive disease is suspected. Some cats respond to diet alone. Others need medication as well.
There is no single food that works for every IBD cat. That is probably the most important thing to understand.
What is a novel protein?
A novel protein is simply a protein your cat has never eaten before. Not something marketed as unusual. Not necessarily an exotic meat. Novel to your cat.
If your cat has eaten chicken, turkey, beef, lamb, rabbit, duck, fish and venison, none of those are truly novel for that cat. This is why taking a proper food history before choosing your elimination diet matters.
Depending on what your cat has previously eaten, proteins such as emu, goat, kangaroo or pork may provide options. Pork is one we often ask about because many cats have not eaten significant amounts of it previously, yet it is generally much easier and less expensive to source than exotic meats.
What should an elimination trial look like?
Simple. Really simple.
An elimination trial is not the time to introduce a new meat, three supplements, a new probiotic and some treats on Monday and then try to work out what caused diarrhoea on Wednesday. Choose your diet carefully and change one thing at a time. The diet also needs to be fed exclusively. Treats, flavoured medications and table scraps can interfere with a proper trial. IBD cats can be sensitive to change, so transitions may need to be considerably slower than they would be for another cat.
The easiest Raw Meow starting point
For someone beginning a novel protein trial, our Freeze Dried Emu and Freeze Dried Goat meals are usually the simplest place to start, if those proteins are novel for your cat. Both are made without egg and without green lipped mussel, which keeps the animal protein profile deliberately simple.
We removed egg and GLM from our Hypoallergenic range specifically because we did not want unnecessary animal proteins muddying the waters during a food trial. Egg is a chicken-derived protein and has been reported as an allergen in some cats. GLM is shellfish-derived. Neither is a common IBD trigger, but when we are trying to isolate what a cat is reacting to, simpler is better.
If you would prefer to source the meat yourself and control exactly what goes into the bowl, our Hypoallergenic Raw Meow Mix is formulated with roo liver and contains no egg and no green lipped mussel. You choose the novel protein to pair it with. If your cat has never eaten pork before, for example, that is often a practical and affordable place to start.
For even greater control, our Neutral Raw Meow Mix contains no animal-derived ingredients at all, allowing you to choose every protein component separately.
What about probiotics?
The relationship between gut microbiota and chronic gastrointestinal disease is well established, and pre/probiotics are now considered part of standard management rather than an optional add-on. But again, introduce one thing at a time.
We recommend Ava's Blend as our go-to probiotic for IBD cats. It is worth noting that it does contain bovine colostrum, so if your cat has a known sensitivity to dairy-derived ingredients, factor that in before starting.
Living with an IBD cat
Three steps forward, one step back is the normal early experience. A flare does not mean everything you have been doing has failed. These cats wax and wane, and learning to recognise your own cat's pattern is one of the most valuable things you can do.
Get to know your cat's baseline. What does normal look like for them specifically.. their appetite, their energy, their stool, their coat. The sooner you spot that something is shifting, the sooner you can act. Flares that are caught early are generally much easier to manage than ones that have been building for days.
Talk to your vet about a flare plan before you need one. Some vets are comfortable allowing you to keep anti-nausea and pain medication on hand at home so you can respond immediately rather than waiting for a clinic to open. It is worth having that conversation while your cat is stable rather than scrambling during a flare.
The most important thing during a flare is keeping your cat eating. A cat who stops eating entirely is a cat who deteriorates quickly. It does not matter much what they will eat in that moment. Something is better than nothing. Warm it up, try something different, offer smaller amounts more frequently. Whatever it takes to keep food going in.
There is no perfect IBD diet.
For one cat the answer may be emu. For another, goat. For another, pork alongside a hypoallergenic meal completer. And for another, further diagnostics because food was not the underlying issue at all.
The objective is not to find the most exotic diet possible. It is to find something nutritionally appropriate that your cat will actually eat, that their gut tolerates, and that you can realistically continue feeding. If you are not sure where to start, our Dip Your Paw Hypoallergenic pack is designed exactly for that.. a low-risk way to try a few options before committing to larger quantities.
If you have an IBD cat and feel completely overwhelmed, come and join our Australian Raw Fed Cats Facebook group. IBD comes up regularly, there is a wealth of experience in the group, and plenty of cat parents who have been through the same process.
Ava is one of them. I have lived the food refusals, the flares, the medications and the constant second guessing too. Sometimes having other people who understand just how complicated these cats can be makes the whole thing a little easier.
Sources: Cornell Feline Health Center, Inflammatory Bowel Disease. Merck Veterinary Manual, Chronic Enteropathies in Small Animals (updated June 2026). Mueller et al., BMC Veterinary Research. Mueller et al., The Veterinary Journal.