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Elimination Diets and Food Allergies

Itching, skin changes, recurring diarrhea, or one-sided ear infections: These symptoms point to a food allergy in your dog. While this isn’t always the case, it’s a strong possibility worth investigating. The only reliable way to determine if your dog has a food allergy is through a so-called elimination diet. This process is time-consuming and requires a lot of patience and discipline, but it can provide clear answers and relief for your pet.

If your dog constantly scratches, licks their paws, or shakes their head, these may be signs of a food allergy. However, since these symptoms can also stem from other causes, your veterinarian must first rule out other possibilities, such as infections, parasite infestations, or contact allergies. Once these potential triggers have been eliminated, an elimination diet is often recommended to confirm the presence of a food allergy. While most allergy tests offer only about 50% accuracy, an elimination diet is the only reliable method to confirm the presence of a food allergy and identify the specific trigger even though it can be a lengthy process. Let’s explore how this process works and why it’s so effective.

Diagnosing a Food Allergy with an Elimination Diet

If your dog shows symptoms like one-sided ear infections, digestive issues, or skin problems that cannot be linked to infections, parasite infestations or systemic diseases, an elimination diet might be the best way to identify the underlying cause. While there are allergy tests available for dogs, they often lack accuracy and reliability. An elimination diet remains the gold standard for diagnosing food allergies. To ensure the best results, please consult your veterinarian for guidance and support throughout the process.

Common Triggers for Food Allergies in Dogs

Before diving into allergies, it’s essential to understand the difference between an allergy and an intolerance. 

An allergy is an immune system overreaction to specific substances, which may be found in dog food. However, allergens such as pollen or insect bites can also trigger allergic reactions. When a dog experiences an allergic reaction, symptoms may include itching, skin rashes, digestive issues and other related problems.

In contrast, an intolerance is not an immune response but rather a negative physical reaction to certain food products or ingredients that the dog’s body cannot digest properly. Symptoms of an intolerance typically include gastrointestinal issues such as diarrhea, vomiting, and bloating. In summary, an allergy involves the immune system, whereas an intolerance is related to digestive difficulties. 

Most food allergies in dogs are caused by common protein sources such as beef, chicken, or pork. Other triggers include eggs, dairy, and wheat. These allergens are often used in various concentrations in the industrial fodder production. Therefore, transparency about what’s in your dog’s food, and avoiding known allergens, is another reason homemade dog food is recommended. 

However, a dog can develop a food allergy to virtually any ingredient, even in small amounts such as a tiny piece of cheese, a treat, or an unidentified ingredient in processed feed. It does not come down to the frequency: Even if your dog gets the improper protein or carb only once a week it could already be enough for an allergic reaction.

Basics of an Elimination Diet

Generally, an elimination diet feeding your dog a simplified diet of protein and carbohydrate sources they haven’t previously been exposed to. The idea is that the immune system won’t recognize these ingredients, preventing an allergic reaction. For example, if your dog has never eaten kangaroo meat, their immune system won’t have antibias prepared to react to these foods. 

 Consistency is key to the success of an elimination diet. After selecting a protein source (e.g., horse meat) and a carbohydrate source (e.g., potatoes), you can choose to use hypoallergenic commercial food or prepare the meals yourself. Cooking the food yourself offers full control over the ingredients, a significant advantage, and is often more cost-effective. However, it’s essential to work closely with your veterinarian, follow their guidance, and commit to the elimination diet for at least eight weeks. Important: No foods outside the elimination diet are allowed during this time, including treats. Snacks must be made exclusively from the selected ingredients to avoid any risk of contamination.

How Long Does an Elimination Diet Last?

An elimination diet typically lasts eight to twelve weeks. If your dog’s symptoms improve during this time, it strongly indicates a food allergy. However, secondary infections caused by excessive scratching, such as skin infections, can complicate the interpretation of results. If you notice that the symptoms have improved but have not disappeared completely, the elimination diet may need to be extended for an additional two weeks while treating the secondary infection locally with ointments.

Steps of an Elimination Diet

1. Elimination Phase

The strict elimination phase begins with feeding your dog a hypoallergenic diet consisting of only one protein source and one carbohydrate or vegetable source. All other foods, including snacks or even small amounts of other proteins, vegetables, or carbs, are strictly prohibited, as they could distort the results and render the entire elimination diet ineffective. This phase typically lasts eight to twelve weeks, allowing the body time to reduce reactions to potential allergens. Important: Be cautious with medications during this phase, as they may contain allergens. Consult your veterinarian in advance to discuss any necessary medications.

2. Control Phase

During the elimination phase, carefully monitor your dog for improvements in symptoms such as skin irritations, digestive issues, or other common symptoms for a food allergy. If symptoms improve significantly, for example, if ear infections resolve and digestion improves during the hypoallergenic elimination diet, a food allergy is considered confirmed.


3. Provocation Phase

After the elimination phase, the provocation phase begins. Gradually introduce small amounts of individual ingredients that could be allergenic. Feed each new ingredient for at least one week while observing your dog’s reaction. If symptoms return after introducing a specific food, it indicates an allergy to that ingredient, and it must be removed from your dog’s diet immediately.

4. Confirmation of a food allergy

If your dog shows an allergic reaction to a specific food during the provocation phase, their allergy to that ingredient is confirmed. Remove this food from their diet permanently.

5. Therapy in the long run

After the elimination diet, your veterinarian will recommend a long-term diet plan tailored to your dog’s needs. This may include using hypoallergenic food and eliminating any triggering ingredients to prevent future allergic reactions.

Conclusion

An elimination diet is an effective method for diagnosing and managing food allergies in dogs. While it requires patience, discipline, and effort, the results can significantly improve your dog’s quality of life by reducing or eliminating allergic reactions. For the best outcomes, always conduct an elimination diet under the guidance of a veterinarian.

The term “animal by-products” typically refers to category 3 materials, which are by-products of the butchering process that are not suitable for human consumption but are still allowed in pet food. While these materials can be a protein source, they are often of lower quality. 

Individual nutrition for your dog

At LuckyChef, we believe in tailor-made nutrition for dogs. With our customized recipes and the expertise of our vets, we make sure your four-legged friend gets everything they need to be fit and happy.