What to do if your dog has an allergy
When managing allergies in dogs, the most important step is identifying the root cause. Some of the most common culprits include fleas, environmental factors and food allergens. The rest often comes down to minimising exposure to the allergen and finding the right combination of products to reduce irritation and support skin healing.
Symptoms of allergies in dogs
Dogs tend to show signs of allergies through skin and ear issues, so you’ll notice symptoms such as:
- Intense itching
- Irritated skin
- Ear infections
- Licking their paws
- Hair loss and/or bald patches
- Hot spots (moist patches of bare skin)
- Scooting or rubbing against furniture
While allergies tend to trigger an immune response, sensitivities do not affect the immune system. Instead, they often manifest in digestive issues (constipation, diarrhoea, etc.).That said, symptoms can sometimes overlap. This is why consulting a vet is so important when trying to get a correct diagnosis and solution for your dog’s specific reactions.
Most common allergies in dogs
These are the allergies most frequently diagnosed in dogs:
- Flea saliva allergy: The most common of all. Known as ‘flea allergy dermatitis in dogs’, this happens when your dog’s immune system recognises flea saliva as a threat.
- Environmental allergies: The triggers in this case are in your environment, whether it’s pollen, dust mites or mold spores. It can also be referred to as ‘dog hayfever’ and can be ongoing or seasonal.
- Food allergy: While less common, some dogs can react when exposed to specific foods, usually proteins. We’re looking at ingredients like chicken, beef, lamb, dairy, eggs, or grains such as wheat and corn.
Below, you’ll find ways to manage each type of allergy, including products that can help relieve symptoms and answers to frequently asked questions.
Flea allergy dermatitis
How can I manage a dog flea allergy?
Flea bites are a major trigger for allergic reactions in dogs. Even one bite can cause intense itching in sensitive dogs. That’s why year-round flea prevention is essential, even if your dog doesn’t normally have fleas.
What are the best flea treatments for dogs with flea allergies?
Effective options include:
- Spot-on treatments such as Frontline Plus and Advantage
- Flea collars such as Seresto
- Optional, but recommended: Household sprays to control the environment
Products like Frontline Spot On and Advantage are commonly used to both treat active flea infestations and help prevent future flare-ups. They work by killing fleas on contact, while continued use provides ongoing protection, making them a reliable option for both short-term relief and long-term control.
Flea collars, such as Seresto, are typically used for longer-term prevention rather than immediate treatment.
How often should I use flea treatments?
Spot-on solutions normally need applying once a month while flea collars can last several months. For the best results, always follow the instructions provided by the manufacturer.
Another important aspect is consistency, as gaps in protection can lead to infections and flare-ups. This is why year-round protection is the safest, most reliable option.
Can flea treatments reduce itching?
Yes, if fleas are causing the allergic reaction, effective prevention and treatment (since flea control products provide both) can significantly reduce itching and discomfort. Even in dogs with other allergies, flea control is considered a smart addition for managing symptoms.
What other products can I use alongside flea prevention?
To help calm and repair inflamed skin, using a shampoo like Douxo S3 Calm Shampoo can also provide relief when looking to reduce irritation that is already present. Plus, it will also help wash out fleas, eggs and residue.
Environmental and seasonal allergies
How can I treat dog hayfever or seasonal allergies?
The first step in protecting your dog from environmental allergies (whether occasional or recurrent) is to limit exposure to the trigger, like grass or pollen. But as this can be challenging (spores can stick to our hair and clothes, travelling indoors with us), we can also rely on products that help calm and support the skin barrier, such as:
- Calming dog shampoos such as Douxo S3 CALM Shampoo or Burt’s Bees Oatmeal Dog Shampoo
- Omega-3 supplements, like the YuMOVE Skin & Coat Support range or Pooch & Mutt Salmon Oil, which may help support your dog’s natural immune response
How often should I bathe a dog with allergies?
For dogs with allergies, bathing is usually recommended once a week or as recommended by your vet. The frequency may vary depending on flare-ups. Regular washing helps:
- Remove allergens from the coat
- Reduce irritation
- Keep skin clean and supported
Always use a gentle or ‘sensitive’ dog shampoo, like the ones recommended above. Harsh products, especially human shampoo, can irritate the skin further and worsen symptoms.
What can I use for itchy paws in dogs?
Paw irritation is often caused by contact with grass or other environmental allergens. As dogs tend to lick the area constantly, secondary bacterial infections can sometimes develop. Helpful solutions include:
- Wiping or washing your dog’s paws after walks
- Using products that act like a protective barrier, like Douxo S3 Care Pads for Pets or Burt's Bees Paw & Nose Dog Lotion
As with any other sign of allergies in dogs, speaking to your vet is key in identifying the cause of the itchiness.
Food allergies
What foods are dogs typically allergic to?
While food allergies in dogs are uncommon, the ingredients dogs most typically react to are beef, dairy, chicken, wheat and lamb. It’s also possible that your dog may be sensitive to a food. In both cases, avoiding the ingredient is what will provide the most relief.
What is hypoallergenic dog food and how does it help?
Hypoallergenic dog food is designed to reduce the risk of allergic reactions by limiting or modifying ingredients that commonly trigger sensitivities. These diets typically use:
- Hydrolysed proteins. ‘Hydrolysed’ means broken down into very small particles, so the immune system is less likely to recognise them as allergens.
- Novel proteins like salmon, turkey or duck, which are less likely to cause an issue.
- Limited ingredients to reduce exposure to potential allergens.
This makes them one of the most effective starting points for dogs with ongoing itching or skin issues, particularly when guided by a vet.
When should I switch to a hypoallergenic dog food?
If you suspect an allergy of any kind, it’s essential to discuss the symptoms with your vet, who may recommend or prescribe a hypoallergenic food. But, in general terms, a diet change is often worth considering if your dog has:
- Year-round itching
- Recurring ear infections
- Skin issues that don’t improve with grooming care
In these cases, switching to a hypoallergenic formula can make a noticeable difference, as it can help reduce or stop reactions while nourishing and supporting the skin from within.
What are the best hypoallergenic dog foods?
There are plenty of reputable brands offering hypoallergenic dog food in dry and wet varieties. Some of the most popular options vets recommend are:
- Royal Canin Hypoallergenic Adult Dry Dog Food
- Hill's Prescription Diet z/d Food Sensitivities Dry Dog Food
- Purina Pro Plan Veterinary Diets HA Hypoallergenic Dry Dog Food
- James Wellbeloved Grain-Free Adult Dry Dog Food - Turkey & Veg, also available with Fish & Veg.
Any recommendations for hypoallergenic dog treats?
Some high-quality options include:
How long does hypoallergenic dog food take to work?
Most dogs need 6 to 8 weeks on a consistent diet before improvements become noticeable.
During this time:
- Avoid mixing foods
- Use compatible treats
- Monitor changes in itching and skin condition
Persistence is very important, as your dog’s immune system will have the best chance to adapt and respond to the diet changes.
Can changing my dog’s food improve skin allergies?
Yes, diet plays a major role in skin health. Even in dogs without a confirmed food allergy, switching to a sensitive or hypoallergenic formula can sometimes reduce inflammation, improve coat condition and support clear, healthy skin. This is because your dog may have sensitivities, and hypoallergenic dog food is often formulated to support skin health.
Can skin care products reduce itching?
Yes, prevention is key but topical products are one of the fastest ways to relieve symptoms during flare-ups. While they don’t address internal triggers, they provide significant relief by soothing the skin, promoting healing and helping to prevent further irritation. In cases of a food allergy, skin care works best when combined with a hypoallergenic diet.