Allergy in Dogs: Causes, Symptoms & Treatment

Allergies in dogs are a common health problem caused by an overreaction of the immune system to certain substances, known as allergens. Allergens such as pollen, fleas, dust mites or specific food ingredients can trigger an allergic reaction, which can lead to discomfort and health problems in dogs. Dogs may show symptoms such as itching, skin inflammation and digestive problems.

What are the most common allergens for dogs?

Dogs can have allergic reactions to various substances. The most common allergens are:

Pollen: Many dogs react to grass, tree or flower pollen, particularly in spring and summer.
Fleas: Flea bites can lead to flea allergy, where even a single bite can cause itching and skin inflammation.
House dust mites: Dust and dander in the home are also often the culprits.
Food ingredients: Common food allergens include chicken, beef, dairy, wheat and soya.

These allergens trigger the dog’s immune system, leading to symptoms such as itching, rashes and digestive problems. By limiting exposure to environmental factors, such as pollen or fleas, allergies can be partially prevented. Flea prevention, for example, is crucial for dogs that are sensitive to flea bites.

How can you tell if your dog is allergic?

Allergies in dogs can manifest in various ways. The most common symptoms are:

Itching: Dogs often scratch their ears, belly and paws intensely.
Skin rashes and inflammation: These often appear as red, irritated patches on the skin.
Ear infections: Ear infections are common in dogs with food or flea allergies.
Digestive problems: Vomiting and diarrhoea are often signs of food allergies.

It is important to keep an eye on the symptoms and visit the veterinarian in good time for a proper diagnosis.

What symptoms might indicate a food allergy?

Symptoms of food allergies are often difficult to distinguish from other allergic reactions. Common signs include:

Chronic ear infections: Recurring ear infections may indicate food allergies.
Digestive problems: Diarrhoea, vomiting and flatulence can be symptoms of an allergy to certain nutrients.
Redness and skin problems: Dogs can also develop skin rashes due to food allergies.

By following an elimination diet, owners can determine which food is causing the allergic reaction. Visual aids such as before-and-after images of affected dogs can help in identifying the symptoms.

What is atopy and how does it differ from a food allergy?

Atopy, or atopic dermatitis, is a genetically determined sensitivity to environmental allergens, such as pollen and house dust mites. This differs from food allergies, which are caused by an immune system reaction to certain nutrients. Atopy : Caused by environmental factors such as pollen, mould or dust mites. Food allergies : Reactions to specific ingredients in food, such as chicken or wheat.

What are the treatment options for allergies in dogs?

Various treatments are available for dogs with allergies, depending on the type and severity of the allergies:

Antihistamines: Often prescribed to reduce itching and inflammation.
Corticosteroids: These powerful medicines are used for severe allergic reactions.
Immunotherapy: A long-term treatment in which the dog is gradually exposed to small amounts of the allergen to desensitise the immune system.
Hypoallergenic dog food: This special diet eliminates known allergens and can help dogs with food allergies.

How does immunotherapy work in dogs?

Immunotherapy is an effective treatment for dogs with chronic allergies. This therapy works by gradually acclimatising the dog’s immune system to allergens, so that it reacts less strongly. This process can take months or even years, but can significantly reduce allergic reactions.

Duration: The therapy can take a long time, but often provides long-term relief.
Effectiveness: It is particularly useful for severe environmental allergies.

What is the difference between an allergy and a food intolerance?

An allergy is an immune response to a specific substance, whereas a food intolerance is caused by the body’s inability to digest certain nutrients. For example:

Allergy: Often leads to skin problems, itching and ear conditions.
Intolerance: Causes digestive problems, such as diarrhoea and flatulence.

Understanding this difference is important because the treatment for both conditions is different.

Elimination diet: Identifying allergies

A common cause of eczema in dogs is a food allergy. By following an elimination diet, you can determine which ingredients in the food are causing the skin reaction.

Identifying Allergies: Common allergens in dog food include beef, chicken, dairy and grains such as wheat and maize.
Special Food: An elimination diet involves temporarily feeding your dog hypoallergenic food that contains no known allergies. If the eczema symptoms improve, new ingredients can be gradually introduced to determine what is causing the allergies.

Example : Use food containing duck or lamb instead of beef or chicken, which can often trigger allergic reactions.

How do you diagnose an allergy in dogs?

Diagnosing an allergy in dogs often begins with a combination of observation and tests. Commonly used methods include:

Blood tests: These allow the veterinarian to identify specific allergens.
Skin tests: A small amount of allergen is applied to the skin to measure a reaction.
Elimination diets: By eliminating certain foods one by one, the cause of food allergies can be identified.

What is an elimination diet and how does it help diagnose food allergies?

An elimination diet is an effective way to diagnose food allergies. By systematically removing certain ingredients from the dog’s diet, owners and veterinarians can determine which foods cause allergic reactions. This process requires patience, but is often the best way to identify a food allergy.

Can dogs have hereditary allergies?

Yes, allergies can be genetic. Some dog breeds have an increased risk of allergies due to their genetic predisposition. This is common in breeds such as the Golden Retriever and the Bulldog. Heredity plays a significant role in atopy, meaning that certain breeds are more susceptible to environmental allergies.

Which dog breeds are more prone to allergies?

Some breeds that are prone to allergies include:

Golden Retrievers
German Shepherds
Bulldogs
West Highland White Terriers

These breeds often suffer from both food and environmental allergies, and it is important that owners take this into account when providing care for their pets.

What can you do to prevent allergies in dogs?

Although allergies cannot always be prevented, owners can take certain measures to minimise exposure to allergens:

Regular cleaning: Keep the dog’s living environment clean to reduce exposure to dust and pollen.
Flea prevention: Use flea treatments to prevent allergic reactions caused by flea bites.
Hypoallergenic food: Consider special food for dogs with food allergies to avoid allergic reactions.

How can hypoallergenic dog food help?

Hypoallergenic dog food does not contain common allergens such as chicken, beef or wheat. This type of food can help dogs suffering from food allergies by removing these allergens from their diet. Brands of hypoallergenic dog food often feature ingredients such as salmon or lamb, which are less likely to cause allergies.

How often should you have an allergic dog checked by a veterinarian?

Dogs with allergies should be checked regularly by a veterinarian, especially if symptoms worsen or do not improve with treatment. The frequency of check-ups depends on the severity of the allergies and the chosen treatment method:

Mild allergies: For dogs with mild symptoms, a check-up every six months is often sufficient. This allows the veterinarian to assess the progress of the treatment and make any necessary adjustments.
Chronic or severe allergies: Dogs with chronic or severe allergies may require quarterly check-ups to optimise the treatment plan. These check-ups monitor for any new symptoms or side effects from medication.
During immunotherapy: Dogs undergoing immunotherapy require more frequent check-ups, particularly in the initial phase of treatment. In the first few months, this may be every four to six weeks, depending on how the dog responds to the therapy.

In addition to these regular check-ups, it is important that owners remain alert to any new or worsening symptoms. A sudden change in the dog’s health, such as increased itching, skin inflammation or digestive problems, may be a reason to schedule a visit to the veterinarian sooner.

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