Allergies in Dogs

Dogs with Skin Issues Solutions: Guidance and Care
 

If your dog is itchy, has sore ears or regular tummy upsets, allergies might be to blame. 

Dogs can react to fleas, food, or environmental triggers such as grass, pollen, dust - even cleaning products and fragrances.

And we’ll show you how an at-home intolerance test can save time, money, and stress - helping you get to the root cause rather than just treating the itch.

Signs your dog may have allergies

If your dog has allergies, you’ll often notice:

• Constant scratching or itching
• Licking paws or chewing legs
• Red or inflamed skin
• Recurrent ear infections
• Smelly ears or yeasty skin
• Upset stomach or bloating

If this sounds familiar, or your have dogs with skin issues, your dog may be reacting to something in their environment or diet.

What you’ll learn in this guide:

• The difference between dog allergies and intolerances
• Key allergy symptoms to watch out for
• The most common types of allergies in dogs
• How food, skin, yeast, and seasonal allergies overlap
• Why recurring yeast infections often link to allergies
• Testing options - vet vs at-home tests
• Allergy treatment options that help (and what only masks the problem)

What is an allergy?

An allergy happens when your dog’s immune system overreacts, treating something harmless (like chicken, or pollen) as a threat. This sets off a chain reaction in the body - causing inflammation, itching, redness, ear infections, or digestive upset.

The tricky part is allergy symptoms can look very similar - whether the trigger is food, fleas, or the environment. 

And intolerances (which don’t involve the immune system) can make things even more confusing. That’s why so many owners end up stuck in a cycle of elimination diets, expensive vet visits, and endless shampoos and creams that only mask the symptoms.

Dog Allergy vs Intolerance

True allergies affect the immune system and affect only around 10-15% of dogs. Whereas intolerances are more common and can be easily identified using a dog intolerance test. 

An allergy is an immune system reaction.
An intolerance is difficulty digesting/processing something. 

Most veterinary allergy testing is done using blood tests or intradermal skin tests. These can sometimes identify environmental triggers such as pollen or dust mites, but they’re often unreliable for food allergies - and they can’t detect intolerances at all.

👉 Read our full guide on food allergies in dogs here.

 

Allergy symptoms in dogs

• Every dog will show allergies a little differently, but there are some common red flags to watch out for:
• Constant scratching or licking
• Red, sore, or yeasty-smelling ears or paws 
• Hot spots, hair loss or bald patches
• Chewing at the paws (often worse after walks)
• Runny eyes or nose
• Frequent sneezing or coughing
• Ongoing or intermittent tummy upset (vomiting, diarrhoea, bloating, excess gas)
• Recurring skin infections or yeast build-up
• Hives or raised bumps on the skin.

In rare cases, an allergy can trigger a severe reaction known as anaphylaxis. This may look like sudden swelling of the face or muzzle, hives all over the body, collapse, or difficulty breathing. If you ever see these signs, treat it as an emergency and seek veterinary attention immediately.

Why dog allergies are so difficult to identify

This is where many owners get stuck.

Different types of allergies cause the same symptoms:

• Food issues can look like skin allergies
• Environmental triggers can cause ear infections
• Yeast problems often come from underlying allergies

So even if you:

• Change food
• Try supplements
• Use shampoos

You may not see lasting results - because the trigger hasn’t been identified. 

Most common dog allergies
 

1. Flea Allergy Dermatitis

By far the most common dog allergy is caused by fleas. The dog’s immune system reacts to the flea saliva causing itching, sore and red skin, scabs and even hair loss. 

2. Food allergies

Less common and frequently misunderstood, dog food allergies can be triggered by proteins, legumes, carbohydrates, or vegetables. More often, intolerances are to blame rather than true allergies. Symptoms may include itching, dry or inflamed skin, and gastrointestinal issues like bloating or upset tummy. 

3. Atopic Dermatitis (Environmental/seasonal allergies)

Environmental allergies often flare up seasonally and can be triggered by pollen, grass, mites, dust and chemicals. Since these are often contact allergies, symptoms such as licking or chewing paws or scratching ears and underarms are common. 
 

Could it be something else?

Not every itchy dog has allergies. Other issues can cause similar symptoms, including:

• Mites or mange - parasites that irritate the skin.
• Ringworm - a fungal infection, not an allergy.
• Hormonal imbalances such as thyroid disease.
• Stress, boredom or pain - some dogs lick or chew sore joints or to try and self soothe.

Skin infections are also common, but in many cases they’re secondary to an allergy. 

Scratching and inflamed skin create the perfect environment for bacteria and yeast to grow - so if infections keep coming back, an allergy is often lurking underneath.

👉 Read more about dog skin problems here. 

My dog’s scratching but I can’t see fleas…

Fleas can be really hard to spot with the naked eye, especially on dogs with dark or thick fur. Fleas are small and a dark reddish-brown colour. They also move very quickly and are brilliant at hiding - which is why they can be hard to miss. 

Try parting your dog’s fur while using a torch or looking on the belly area and around the legs where there is less fur. Or try a fine-toothed flea comb. You can also look out for dark coloured specks on their skin or in bedding - which are flea dirt (faeces). 

Your vet can do a skin scrape to check, or you can treat for fleas and see if the itching improves.

Find out more about why your dog is itching but has no fleas.

Dog food allergies

Food allergies are notoriously hard to identify. Some dogs react to common proteins (chicken, beef, lamb), but others develop sensitivities to vegetables, legumes, grain, or even novel proteins. 

Exclusion diets are one way to get to the bottom of what’s causing your dog’s symptoms. But in reality, they’re very hard to do properly. 

Your dog mustn’t ingest anything other than the novel protein diet selected for them for a whole 8 weeks. Even with a lot of effort from owners, the exclusion diet often fails due to hidden ingredients in treats or supplements, scavenging, children sneaking scraps or dropping food - or even licking of your other pet’s bowls. 

Instead of guessing, an intolerance test can point you toward likely culprits - saving both money and stress on endless food changes.
 

 👉 Read more in our blog on food allergies in dogs.

Dog seasonal allergies

If your dog gets itchy paws after a walk or sneezes when the pollen count is high, environmental allergies may be to blame. Cleaning products, candles, and even air fresheners can also be hidden triggers.

Things you can try to help include:

• Wiping or rinsing paws down after a walk
• Using air purifiers
• Switching to chemical free or probiotic cleaners and laundry detergents
• Hoovering and washing fabrics often

ItchyDOG’s intolerance test covers 400+ foods and environmental allergens which can remove the guesswork and help you more quickly identify the root causes of your dog’s symptoms. 

Dog skin allergies 

Canine Atopic Dermatitis (CAD) - aka ‘skin allergies’ - is one of the most common reasons dogs visit the vet. It can be triggered by fleas, food, or environmental allergens.

The difficulty with skin allergies in dogs is the symptoms show up no matter what the underlying cause is. That’s why two dogs with completely different triggers might both present with red, itchy, inflamed skin.

Topical creams, medicated shampoos, and steroids can sometimes calm the itching, but they don’t remove the cause. 

Without identifying and reducing exposure to the trigger, your dog’s immune system remains in a constant ‘fight mode.’ Even if the itching looks better on the surface, the body is still inflamed on the inside - which can affect long-term health and quality of life.

👉 Read our blog on skin allergies in dogs.

Dog yeast infection

Yeast infections in dogs can be notoriously difficult to solve. Yeast thrives in warm, damp spots like ears and paws. Many dogs are given repeated antibiotics or ear cleaners, but if the yeast keeps returning, there’s often an underlying allergy feeding it.

We know owners who’ve spent thousands on antibiotics, steroids, swabs and cleaners - only to find the yeast infection returns. Testing for triggers can stop the cycle.

 👉 Read our blog on yeast infections in dogs.

Allergy testing

Once you’ve ruled out the obvious culprits like fleas, the next step is usually testing. This is where things can get confusing - because not all tests are created equal.
 

Veterinary allergy tests

Most vets will use either:

• Intradermal skin testing - injecting small amounts of allergens under the skin to see if there’s a reaction.
• Blood tests - measuring IgE antibodies to certain allergens.

These can sometimes help identify environmental triggers such as pollen or dust mites, but they:

• Rarely give clear answers for food allergies
• Cannot detect food intolerances at all
• Can cost hundreds of pounds
• Require taking your dog to the vets for blood withdrawals and injections 

The ‘gold standard’ vet method for food allergy is still an elimination diet trial - strict feeding of a novel protein for 8 weeks. But as we’ve covered in this blog, these diets are hard to follow perfectly and easy to sabotage (scavenging, hidden ingredients, or kids sneaking scraps).

At-home intolerance tests

At-home tests are hundreds of pounds cheaper than vet tests and less stressful for your dog. Itchy Dog’s test screens for over 370 foods and environmental triggers, plus provides insight into vitamin and mineral deficiencies. 

You send in a simple hair sample, and receive a clear, easy-to-understand report in days.

Many owners tell us that intolerance testing finally gave them clarity. Instead of weeks of trial-and-error diets, they had a clear shortlist of what to avoid. Within a few weeks, their dog was far more comfortable.

Benefits include:

• An easy to understand report + bonus test results for vitamin and mineral deficiencies. 
• Clear guidance on what to do to eliminate items causing symptoms
• Less stress and guesswork than endless food trials
• No more researching supplements, diets and shampoos 

👉 Order your intolerance test here

How much does allergy testing cost?

An allergy test via your vets will cost hundreds of pounds but our 5 star rated intolerance test costs just £39.99 - and you can do it at home.
Although it is not a traditional dog allergy test, Itchy Dog’s  premium intolerance test can identify your dog's environmental and food sensitivities that may not be detected by regular blood allergy tests. 

Remember: true immune allergies only affect around 10-15% of dogs. Intolerances are much more common and can be identified quickly with our test.

You can find out more about the cost of allergy testing here: https://www.itchydog.uk/blogs/dog-allergy-test-cost-in-the-uk 

How to stop dog allergies immediately

Medications (like antihistamines or steroids) may bring short-term relief, but the allergy is still there beneath the surface. The longer your dog’s immune system stays ‘on high alert,’ the more damage it can do. Finding and removing the trigger is the only real solution to stopping dog allergies. 

Key takeaways

• Allergies and intolerances are common in dogs – but symptoms overlap.
• Itching, sore ears, paw licking, and tummy upsets are big red flags.
• Food, fleas, and environmental factors are the top triggers.
• Yeast infections often signal an underlying allergy.
• Vet tests are costly and don’t show intolerances.
• At-home intolerance tests are quick, affordable, and give clear answers.
   

Treating allergies in dogs

• Identify the allergen (Test early so you’re not stuck chasing symptoms).
• Remove the allergen wherever possible (food is easiest, environmental can be trickier).
• Support your dog’s system - gut health, nutrition, and reducing exposure to chemicals can all help.

Ready to stop the itch and get answers? 
👉 Order your Itchy Dog intolerance test today for £39.99.