Why Novel Proteins Help Sensitive Dogs: Understanding Buffalo, Venison and Rabbit
Every time your dog eats, the immune cells lining their gut check the proteins passing through and make a quick decision: familiar and fine, or foreign and worth fighting. Most of the time they get it right. But that decision is based on history. A dog who has eaten chicken or beef in almost every meal, chew and training treat for years has put those proteins in front of the immune system thousands of times – and for some dogs, the verdict eventually changes.
When it does, you don't see the immune system at work. You see the result: loose or inconsistent stools, sickness after meals, more wind than usual, or a dog who stops showing interest in the bowl. UK vets often hear this described as a ‘sensitive stomach’, but that's a pattern of symptoms rather than a diagnosis. The cause sits further upstream.
That's what makes it so frustrating to sort out. The trigger is tied to what your dog has eaten before, not to what the bag on the shelf promises. Switch to a ‘new’ recipe that still lists chicken further down the ingredients, or keep handing out beef chews while you change the main meal, and the gut keeps meeting the same protein. Weeks go by. Nothing clearly improves. You can't tell whether the new food failed or the old protein crept back in, so you start again – another bag, another month, the same unsettled dog.
We're The Buffalo Co, a family-run business in Alcester, Warwickshire, and single-protein treats are what we make, so this is a question we're asked a lot. Below are five things worth understanding before you choose a novel protein dog food or treat for a sensitive dog.
1. Why do dogs start reacting to chicken and beef?
Dogs develop reactions to chicken and beef mainly because they eat so much of them. These are the most common proteins in UK commercial dog food and treats, so they are also the proteins most often found behind diagnosed food reactions. The more often the immune system meets a protein, the more chances it has to misjudge it.
Think of your dog's immune system as learning from experience. Each protein it meets gets filed as either tolerable or foreign, and that filing depends on your dog's own food history. Because chicken, beef and lamb turn up in so many foods and treats, they are the proteins most UK dogs have met most often – which is why they are overrepresented when vets diagnose food reactions.
If you'd like the bigger picture of how enzymes, gut bacteria and the immune system work together, our guide to how your dog's digestion actually works walks through the three core systems in plain English.
Food allergy or food intolerance?
Owners often use these words as if they mean the same thing. They don't:
- Food allergy is driven by the immune system. It wrongly treats a food protein as a threat and reacts to it.
- Food intolerance doesn't involve the immune system. The gut simply struggles to cope with a particular food.
Both are linked to what your dog eats regularly, and the signs overlap heavily: runny stools, sickness, gas, a fussy appetite. You can't reliably tell them apart at home, which is why your vet is the right person to make that call. What you can do is reduce how often your dog meets the usual suspects – and that's where novel proteins come in.
2. What makes a protein ‘novel’ for your dog?
A protein is ‘novel’ when your dog has rarely or never eaten it before. Because their immune system has had little or no contact with it, there's less chance it has already learnt to react. Novelty belongs to your dog's personal food history, not to the animal the protein comes from.
Buffalo, venison, rabbit, duck and kangaroo are often called novel proteins because few UK dogs have eaten much of them. But the label only holds true if your dog's history agrees. A spaniel raised on venison kibble gets no novel advantage from venison. So before you buy anything, write down every protein your dog has eaten – main meals, chews, training treats, the lot.
The logic is simple. A protein the immune system has rarely met is less likely to have been filed as a threat, so it carries a lower risk of a reaction. It also lowers the risk of cross-reactivity, where a dog that reacts to one protein also reacts to a closely related one. That's why single-ingredient, novel-protein treats are widely recommended for dogs with suspected food sensitivities, and why researchers keep testing the safety and digestibility of new protein sources for dogs. If you're looking for a single protein dog food for allergies, this is the principle that should guide your choice: unfamiliar to your dog, and only one of it.
What about ‘hypoallergenic’?
You'll see ‘hypoallergenic’ on plenty of UK treat packs. It's used to suggest a lower chance that your dog has met the protein before. The catch is that the word has no legal definition in UK pet food law, and neither does ‘novel protein’. There's no agreed threshold for how unfamiliar a protein must be before a brand can call it novel. No protein is guaranteed to avoid a reaction in every dog, so treat both words as a prompt to ask questions, not as a promise.
3. How do buffalo, venison, rabbit and other novel proteins compare?
The best novel protein is the one your dog hasn't eaten before and will happily eat. Beyond that, the real differences between buffalo, venison, rabbit, duck, kangaroo and bison come down to how easy they are to find in the UK, what formats they come in, price and how openly brands explain their sourcing.
We'd be wary of anyone who names a single best novel protein dog food in the UK as if one option wins for every dog. What decides it is your dog's history, their chewing style and what they'll actually eat. Here's how the main options stack up on the things you can check.
Buffalo: sourcing and sustainability
The ‘buffalo’ in UK dog treats is almost always water buffalo (Bubalus bubalis), not North American bison. Most of it comes from India, which has the world's largest domesticated water buffalo population and a large buffalo meat industry. Treat parts – ears, horns, tails, trachea, lung, tripe, paddywack and muscle meat – come from animals inspected and passed as fit for human consumption. They're simply the parts that don't go into human food.
That's the model we follow at The Buffalo Co: no animal is slaughtered to make our treats. Each part is dried with nothing added – no preservatives, flavourings or fillers – so the ingredients list has one line. In Great Britain, chews like these must also be made at sites approved by the Animal and Plant Health Agency (APHA), treated to destroy salmonella, and tested at an accredited laboratory before dispatch, with the site's approval number printed on the pack.
Buffalo also suits a wide range of chewers, because different parts dry to very different densities:
| Buffalo part | What it's like after drying | Chew time | Best suited to |
|---|---|---|---|
| Horn | Keratin over a bony core; the densest part | Long-lasting | Powerful, persistent chewers |
| Paddywack (neck ligament) | Firm and fibrous; roughly 75–85% protein on a dry-matter basis | Long-lasting | Determined chewers |
| Tail | Medium density, with visible bone | Medium | Dogs who want a middle-ground chew |
| Trachea | Rings of cartilage; lighter | Shorter | Moderate chewers |
| Ear | Flat and leathery | Shorter | Lighter treating |
| Lung | Puffs up into a light, airy texture | Short | Training rewards and low-calorie treats |
For more on matching chews to your dog, see our guide to natural whole-part chews for dogs with food sensitivities.
Venison and rabbit: what to check
Venison and rabbit are common examples of novel proteins, sold as complete foods, chews and training treats. They work on exactly the same principle as buffalo: useful if your dog hasn't had them, far less useful if they have. A product named after one animal isn't automatically single-protein, so read the full ingredients list rather than the front of the bag. Prices vary between brands and formats, so compare cost per gram, not per pack.
Emerging options: duck, kangaroo and bison
Duck and kangaroo also appear on novel protein lists, and the same history test applies. Bison is the outlier. It's native to North America and parts of Europe, rarely used in commercial pet treats, and costs considerably more at wholesale because supply is limited and the animals are slow to reach market weight. If a UK pack simply says ‘buffalo’, it almost certainly means water buffalo.
Cost and accessibility
Natural chews have gone mainstream. Around 65–70% of UK dog owners now buy them regularly, up from about 45–50% in 2019, largely as people move away from rawhide. You'll find novel proteins at big chains such as Pets at Home, in independent pet shops and groomers, and online. Premium single-ingredient treats are mostly sold direct by the brands that make them, which is usually where you'll get the clearest answers about sourcing. Whatever you buy, a brand should be able to tell you where the animal came from and how the treat was processed. If it can't, that tells you something too.
4. How do novel proteins fit into an elimination diet trial?
In an elimination diet trial, your dog eats a diet built on one protein they have rarely met, with no other protein sources, for a set period. If symptoms settle, food was likely part of the problem. Novel protein treats keep that trial clean, because every reward contains the same single protein as the main diet.
The evidence behind this approach is strong. Food-responsive enteropathy – long-term gut inflammation that settles when the diet changes – accounts for roughly 50–65% of chronic inflammatory enteropathy cases in dogs, according to research on the prevalence of food-responsive enteropathy in dogs. Elimination diets built on a novel protein are the main evidence-based way to manage it, and vets use a dog's response to the diet as a key marker to tell food-responsive cases apart from other kinds of chronic gut disease.
Why ‘single-ingredient’ matters
A trial only works if you know exactly what went in. Single-ingredient means one named animal part and nothing else: no flavourings, no binders, no preservatives, no second meat. Give a ‘buffalo’ treat that also contains chicken during a buffalo trial and you've quietly reintroduced a suspect. That's why limited ingredient dog treats matter as much as the main food – treats, chews, dental sticks and table scraps all count.
If buffalo is your chosen trial protein, our Buffalo Tripe dog treats are made from 100% buffalo stomach lining, at around 80% protein, with nothing added. They have a strong, distinctive smell that makes them a high-value reward when the rest of the diet is restricted. For a balanced look at this particular treat, read what buffalo tripe offers a sensitive digestion, and what it doesn't.
Why the 2–4 week window matters
Dogs with food-responsive enteropathy usually show clinical improvement within 2–4 weeks of starting an appropriate elimination diet. One recent study on the elimination diet timeline for food-responsive cases found an insect-based diet improved clinical signs in 70% of dogs with chronic enteropathy – a reminder that what matters is that the protein is unfamiliar, not that it's exotic.
The changes can go deeper than the stools, too. In dogs with food-responsive enteropathy, a restricted diet has been shown to bring about a partial recovery of the gut's bacterial community, with a richer mix of bacteria that looked closer to a healthy dog's after treatment.
That's exactly why patience matters. Swap proteins after ten days because nothing seems to have changed, and you lose the answer you were working towards. Some dogs take longer than others, and nobody can yet predict which dogs will respond within the window – so agree the plan and its length with your vet before you start, and stick to it.
5. How do you choose the right novel protein for your dog?
Start by writing down every protein your dog has eaten, including treats and chews, then pick one that isn't on the list. Choose a product that names a single animal part as its only ingredient, introduce it on its own, and watch stools, energy and skin for the full trial window.
Read the label properly
Look for an ingredients list with one line – ‘100% buffalo tripe’, for example. Check for a country of origin and an APHA approval number on chews. If the front says ‘with buffalo’ and the back lists several other ingredients, it isn't single-ingredient, however natural the packaging looks.
Introduce one new protein at a time
Pick one novel protein and use it for both meals and rewards. Bring in buffalo treats, a venison food and a rabbit chew in the same week, and if your dog improves – or gets worse – you won't know which one to thank or blame.
Keep a simple diary
A line a day is plenty. Note:
Image generated with AI
- stool consistency
- any sickness or extra wind
- appetite and energy
- skin condition
Your vet will find a written record far more useful than a hazy memory of ‘a bad week’.
Common mistakes to avoid
- Forgetting the extras. Chews, dental sticks, table scraps and treats from well-meaning neighbours all count.
- Switching too soon. Give each protein the full 2–4 weeks, or as long as your vet advises.
- Mixing new proteins. One at a time, every time.
- Reading ‘buffalo’ as bison. They're different animals from different continents, and almost all UK buffalo treats are water buffalo.
- Adding supplements ‘just in case’. In healthy dogs, digestive enzyme supplements at recommended doses haven't been shown to improve digestion; enzyme replacement is a proven treatment only for dogs a vet has diagnosed with exocrine pancreatic insufficiency (see the evidence on enzyme supplementation). Extra products mid-trial also muddy your results.
Novel proteins help sensitive dogs for one straightforward reason: the immune system reacts to what it knows, and most UK dogs know chicken and beef very well. Pick a protein your dog hasn't met, keep everything else out of the bowl and the treat pouch, give it the full 2–4 weeks, and you turn months of guesswork into a clear answer you can take to your vet.
At The Buffalo Co, every treat we make is one buffalo part, sourced from animals already processed for human food and dried with nothing added. If buffalo is new to your dog, it's a sensible, lower-risk place to start your trial.
Questions dog owners often ask
Is buffalo in dog treats the same as bison?
No. Almost all buffalo used in UK dog treats is water buffalo, mostly sourced from India. Bison is a different animal, native to North America and parts of Europe. It is rarely used in commercial pet treats and costs considerably more because supply is limited and the animals grow slowly. If a UK pack simply says buffalo, it almost certainly means water buffalo.
How long should a novel protein trial last?
Plan for at least 2–4 weeks. Dogs with food-responsive enteropathy typically show improvement within that window, and vets use the response as a key sign that food is involved. Feed only the chosen protein during the trial, including treats and chews. Some dogs take longer, so agree the length with your vet and avoid switching proteins early.
Can a dog still react to a novel protein?
Yes. A novel protein lowers the chance of a reaction because your dog's immune system has had little or no contact with it, but no protein is guaranteed to suit every dog. Words such as hypoallergenic and novel have no legal definition in UK pet food law. If symptoms continue after a full trial, speak to your vet.
Do healthy dogs need digestive enzyme supplements alongside a new protein?
No. In a study of healthy adult dogs, enzyme supplements given at the manufacturers' recommended doses made no significant difference to how well the dogs digested energy, protein, fat or carbohydrate. Enzyme replacement is an evidence-based treatment only for dogs diagnosed by a vet with exocrine pancreatic insufficiency, which needs prescription products rather than everyday supplements.
What is the difference between a food allergy and a food intolerance in dogs?
A food allergy involves the immune system, which wrongly treats a food protein as a threat. A food intolerance does not involve the immune system; the gut simply struggles to cope with a particular food. Both are linked to foods a dog eats regularly and the symptoms overlap, so a vet is best placed to tell them apart.
Is a limited-ingredient diet suitable for a pregnant dog?
It can be, according to early evidence. A study comparing a limited-ingredient, single novel-protein diet with a standard diet in late pregnancy found no adverse effects on birth weight, puppy growth or puppy health. That suggests it may be a reasonable option for pregnant dogs with known sensitivities, but always plan any diet change during pregnancy with your vet.