Itching, ear problems, soft stools: when these symptoms keep coming back, the question soon arises, is it the food? This guide explains, in a factual way, how to recognise allergies in dogs, which triggers are typical and which feeding strategy really helps. No promises, no scaremongering, just concrete steps you can put into practice in everyday life.
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Go to Food Finder → Free · No obligation · Less than 2 minutesHow do I recognise an allergy in my dog?
An allergy is an exaggerated reaction of the immune system to substances that are actually harmless. In dogs, such reactions can be triggered by environmental factors such as pollen or house dust mites, but also by ingredients in the food. Important: not every symptom is automatically an allergy. Itching, diarrhoea or reddened skin can have many causes: parasites, infections, hormonal disorders or intolerances. The first step is always structured observation, and if symptoms persist, a veterinary check-up.
Typical symptoms on skin and coat
Many dogs scratch more than usual, lick their paws, rub their heads on the ground or nibble at certain spots. Commonly affected areas include the paws, belly, armpits, groin and ears. The skin can become reddened, dandruff may appear, the coat can look dull, or hair loss can occur from constant scratching. Hot spots, weeping, inflamed patches, can also develop.
Ears as a telltale area
Recurring ear infections, frequent head shaking, an unpleasant smell or brown discharge can be signs. Chronic ear problems in particular should be taken seriously: they cause the dog pain and significantly lower quality of life. An allergy can be a factor here, but it does not have to be the only trigger.
Digestive symptoms
Some dogs show soft stools, diarrhoea, frequent grass eating, flatulence or vomiting. A single bout of diarrhoea is not proof of an allergy; only the pattern over time, the frequency and the combination with other symptoms provide real clues.
Practical tip: a symptom diary helps. Note down food, snacks, new products, parasite prevention, walking routes and behavioural changes. Environmental allergies often show up seasonally, while food allergies tend to appear all year round, though this is not a rule without exceptions.
If a food allergy is suspected, vets often recommend an elimination diet: feeding exclusively a defined protein and carbohydrate source for 8 to 12 weeks, then testing individual components in a targeted way. This takes patience, but it is the most reliable way to narrow down food as a trigger.
The most common triggers of food allergies
With food allergies, dogs usually react to proteins, less often to carbohydrates or additives. The trigger is not the quality of a product, but the individual dog's reaction. A dog can tolerate a food well for months or years and still develop symptoms later, because sensitisation can build up over time.
Commonly cited triggers are protein sources found in many types of food: beef and chicken top the statistics, not because they are inherently problematic, but because they are used in so many foods that the immune system can become sensitised through frequent exposure. Dairy products and egg can also be involved in some cases.
Important connection: the more often and the longer a protein is fed, the more likely it is to end up on the list of suspected triggers. This is why rarer protein sources such as horse, venison or lamb are so valuable when an allergy is suspected, many dogs simply haven't encountered them yet.
Formulations with many protein sources also make it harder to pinpoint the cause. If a food contains several animal species plus liver, fish meal or egg, it becomes more difficult to identify the trigger. A reduced recipe helps directly here.
Not to be underestimated: snacks, chews and supplements. Many elimination diets fail because treats are given on the side that contain exactly the proteins that are meant to be avoided. Anyone wanting to get to the bottom of a food allergy needs to look at the whole feeding environment, not just the main meals.
Why choosing the right food is so crucial with allergies
If food ingredients trigger or intensify allergy symptoms, the right diet can be a key lever for giving the dog some relief. The goal is not a quick miracle cure, but reducing triggers and keeping the body stable. Consistent, suitable feeding can help minimise recurring irritation and make everyday life more predictable.
Many allergic dogs suffer from chronic itching that leads to scratching, licking and secondary skin infections. If the trigger lies in the food, the problem is fuelled further with every meal. Food choice has a daily effect, which is what makes it so relevant.
Skin and gut are closely linked. A dog with a sensitive digestive tract can be stabilised through its diet if the recipe is highly digestible and avoids unnecessary irritants: high-quality ingredients, clear labelling, suitable fat levels and a protein source the dog tolerates.
Consistency is the key: a food can be well chosen, but if changing snacks or table scraps are added regularly, the burden remains. Anyone wanting to manage allergies needs a clear system: a fixed main diet, defined snacks, and as little switching as possible.
Single-protein food: what it does, and what it doesn't
Single-protein food contains only one single animal protein source, for example only lamb, only horse or only venison. This is particularly helpful if a dog reacts sensitively to certain proteins, or if you want to test specifically as part of an elimination diet. Because the recipe is reduced, the likelihood of several triggers overlapping is lower.
However, single-protein doesn't automatically mean a food is suitable for every allergic dog. What matters is whether the dog has already eaten that exact protein source frequently, or whether it is new to them. For diagnostic purposes, a protein source is usually chosen that the dog has rarely or never had before.
Important: a single-protein main food achieves little if chicken or beef treats are added regularly. The single-protein concept has to cover the entire diet, main food and snacks alike.
In practice, many owners use single-protein food in two situations: firstly, to narrow down possible triggers as part of an elimination diet, and secondly, as a long-term solution when a protein source has proven to be well tolerated. Anyone who gets their dog stable this way gains everyday security and reduces the risk of symptoms flaring up again and again.
Grain-free for allergies: sensible or not?
Grain-free dog food is often chosen when owners suspect intolerances, or when the recipe is meant to be reduced overall. The main advantage lies in better clarity: if a type of grain is a possible suspected trigger, a grain-free recipe can help avoid that component.
At the same time, it's important to note: grain-free is not automatically better. Many dogs tolerate grain perfectly well. Grain-free makes sense if the dog reacts to certain types of grain, if digestion is sensitive, or if you want as few variable ingredients as possible as part of a feeding strategy. Grain-free recipes often use alternative carbohydrate sources such as potato or sweet potato.
The combination of grain-free and single-protein is particularly effective: the recipe is reduced to a minimum, which can make all the difference for very sensitive dogs. What remains crucial is that the food is complete and meets the dog's needs.
Natural ingredients and their role
Natural ingredients are often perceived as particularly well tolerated because they are less heavily processed and recipes often manage without unnecessary additives. This is relevant for allergic dogs because every extra component can be a possible irritant. A clear, reduced ingredients list makes it easier to assess tolerance.
In practice, there are two goals: first, reducing potential triggers, and second, designing the diet so that skin and digestion are not placed under additional strain. Many owners look for recipes without artificial colourings and flavourings, as well as without added sugar.
Natural ingredients are no promise of a cure, but as part of a suitable recipe they can help keep feeding straightforward and well tolerated. For many allergic dogs, it is precisely this stability that is the decisive factor.
How to find the right food for your allergic dog
The path to the right food begins with clarity about symptoms and previous feeding. These three questions help with the choice:
- Is the protein source new to the dog? Rarer proteins such as horse, venison, lamb or goat are the best choice if common proteins such as beef or chicken are under suspicion.
- Is the recipe clearly declared and reduced? No umbrella terms such as “meat and animal by-products”, every ingredient should be clearly named.
- Does the food fit everyday life? Activity level, weight and life stage determine energy needs; an allergy-friendly food still has to suit the dog.
Also pay attention to the format: some dogs react differently to dry food than to wet food. What matters is not changing too many factors at once. Otherwise you won't know what actually helped.
When to see the vet? With weeping skin patches, bloody inflammation, significant weight loss, persistent digestive problems or recurring ear infections, a professional check-up is always the first step, not the last.
Dog reacting to beef or chicken?
The Food Finder shows you which NANDOO single-protein variety makes sense to try next, horse, venison, lamb or pork.
Find the right variety → Single-protein · Grain-free · Clearly declaredSwitching food for allergic dogs
Switching food should be planned carefully for sensitive dogs. An abrupt change can put strain on the digestive tract and worsen symptoms, leaving it unclear whether the new food is poorly tolerated or whether the switch was simply too fast.
Tried-and-tested approach:
- Days 1 to 3: 75% old food, 25% new food
- Days 4 to 6: 50% / 50%
- Days 7 to 9: 25% old food, 75% new food
- From day 10: 100% new food
For very sensitive dogs, or as part of an elimination diet, go more slowly, up to 4 weeks is normal. During the switch: fixed feeding times, no table scraps, snacks only with the same protein source. Observe stool consistency, itching, paws, ears and coat, ideally in writing over several weeks.
Elimination diet rule: when an elimination diet is carried out for diagnosis, strict rules apply, not a single treat with a different protein. Even small deviations distort the result and you have to start over. Always have it supervised by a vet.
NANDOO, single-protein for sensitive dogs
For sensitive dogs, reliability counts above all: traceable labelling, clear recipes and consistent quality. NANDOO focuses on exactly that, with dry and wet food designed for transparency, selected ingredients and practical formulations.
All NANDOO single-protein varieties are grain-free, free from artificial additives and clearly declared by protein source. You know exactly what's inside, and if a reaction occurs, you can immediately work out why.
Single-protein dry food for allergy sufferers
- → Lamb & vegetables, single-protein dry food
- → Horse & pomegranate, single-protein dry food
- → Pork & vegetables, single-protein dry food
- → All single-protein dry food for allergy sufferers
Single-protein wet food for allergy sufferers
- → Happy Beef, beef with carrot & green-lipped mussel
- → Happy Chicken, chicken with carrot & apple
- → Happy Deer, venison with carrot & green-lipped mussel
- → All wet food for allergy sufferers
Matching chews and treats, also single-protein
For the single-protein concept to work, snacks and chews need to match too. Choose treats from the same protein source as the main food:
FAQ: common questions about allergies and food
How do I know if my dog has a food allergy?
Signs include year-round itching, recurring ear problems or digestive issues that come and go for no clear reason. A food allergy can usually only be narrowed down with certainty through a consistent elimination diet under veterinary supervision, 8 to 12 weeks, only one defined protein source, no extra snacks.
How long does it take for a new food to take effect?
It varies. For elimination diets, several weeks are planned in because skin and gut don't stabilise within just a few days. Consistency is crucial: not a single treat with a different protein during the test phase.
Are grain-free foods generally better for allergies?
Not generally. Grain-free makes sense if grain is suspected as a trigger, or if you want to reduce the recipe. What matters is individual tolerance and a transparent composition, not the buzzword on the packaging.
Can I still give treats?
Yes, but only with the same protein source as the main food. During an elimination diet, treats should be given strictly according to these rules, otherwise the result will be distorted. NANDOO offers treats in many individual protein sources.
Dry food or wet food for allergies?
Both can work. Some dogs benefit from the higher moisture intake provided by wet food, while others do very well with dry food. What matters is the ingredients, tolerance and a stable routine, not the format.
When do I need to see a vet?
With weeping skin patches, bloody inflammation, significant weight loss, persistent digestive problems or recurring severe ear infections. Even if you are planning an elimination diet, always discuss it with a vet first.
Concrete next steps
If your dog shows recurring itching, ear problems or digestive issues, a structured approach helps:
- Document symptoms, keep a symptom diary, note food, snacks and changes
- See a vet, rule out other causes, plan an elimination diet
- Choose a protein source, one your dog doesn't yet know or barely knows: horse, venison, lamb or pork
- Switch consistently, slowly, with matching snacks, observing for at least 8 weeks
- Note everything down, to make changes over time recognisable
Ready for the next step?
Our Food Finder helps you find the right single-protein variety for your dog, grain-free, clearly declared, no compromises.
Find food now → For allergy sufferers · For sensitive dogs · For dogs on an elimination dietMatching products at kauliebe
For sensitive dogs, we recommend our wet food for allergy sufferers and the dry food for allergy sufferers, each single-variety and grain-free.
Grain-free food for allergies
With food allergies, a single-variety, single-protein concept helps narrow down triggers. Our allergy-friendly varieties come with a single meat source, grain-free and without unnecessary additives.
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