Introduction

For many of us, dogs are not just pets; they are family. Their unconditional love and companionship bring joy and comfort, making them one of the most common household pets. However, for some individuals, the mere presence of a dog can trigger uncomfortable allergic reactions. It is reported that approximately 10–20% of the global population is affected by pet allergies, with cats and dogs being the most common types.¹

This article will explore the world of dog allergies, unravelling their causes, identifying common symptoms, and discussing effective ways to manage and live harmoniously with our four-legged friends. Whether you're a devoted dog owner or someone interested in understanding this prevalent issue, this article will provide you with valuable insights into the intriguing world of dog allergies.

How are dog allergies caused?

Dogs release proteins that can be found in their dander (dead skin cells), saliva, and urine.^2,3 These proteins are small and accumulate on the dog’s fur over time. When dogs’ fur sheds, the proteins can stick to dust particles and transfer throughout the house, including carpets, clothing, walls and furniture.³

When an allergic individual comes into contact with these proteins – usually through inhalation – various immune cells, such as dendritic cells and TH2 helper cells, release inflammatory mediators, such as cytokines, to help produce immunoglobulin E (IgE) antibodies – an allergen-specific antibody produced by B lymphocyte cells. With repeated exposure, more IgE is produced, which, in turn, releases inflammatory mediators such as histamine, leading to irritating symptoms.³ 

Interestingly, the likelihood of dog allergies is higher among individuals living in urban areas (such as the suburbs) than in agricultural areas, due to a lack of protective factors. Less exposure to animals, smaller families and diet have been shown to influence the development of pet allergies.⁴

Symptoms of dog allergies

Dog allergies can manifest in various ways, and symptoms may differ from person to person. Some common symptoms include:³

• Sneezing and a runny nose 
• Coughing and wheezing (particularly in individuals with asthma)
• Itchy, red and watery eyes
• Skin irritation (direct contact with dog allergies can result in skin redness, itching, hives, or eczema)
• Nasal congestion (can make breathing through the nose difficult)
• Chest tightness or discomfort

In severe cases of pet allergies, an extreme and life-threatening multi-system reaction called anaphylaxis can occur. Anaphylaxis occurs rapidly and can manifest with symptoms such as:⁵

• Intense itching 
• Hives 
• Pronounced swelling 
• Difficulty breathing 
• Shock 

In the worst cases and if left untreated, anaphylaxis can lead to death.⁶

It's important to recognise that the severity of allergic symptoms often correlates with the degree of exposure to allergens. When an allergic individual is exposed to larger amounts of allergens or multiple types of allergens simultaneously, symptoms are more likely to worsen. Therefore, one of the key strategies in managing pet allergies is to reduce exposure to allergens, as this can help alleviate symptoms and minimise the risk of severe allergic reactions.^7,8

Treatment of dog allergies

When it's not feasible to completely avoid animals due to allergies, there are several steps you can take to manage your symptoms effectively.

Medications for animal allergies

• Antihistamines: available in pill, liquid (loratadine), and nasal spray (azelastine) form and can alleviate sneezing, itching in the nose and eyes, runny nose, and nasal stuffiness (look for long-acting, non-drowsy antihistamines)
• Corticosteroid nasal sprays: effective at reducing nasal swelling and inflammation
• Eye drops/artificial tears: relieve eye allergy symptoms such as burning sensation, itching, redness, increased tearing, and swelling
• Decongestants: available in various forms (pills, liquids, nasal sprays, or drops) and can help alleviate nasal stuffiness, used for a short duration (usually three days or less). It's essential to consult your doctor before using them if you have certain medical conditions⁷

Other steps to manage animal allergies

• Nasal rinse: Using a saline (saltwater) nasal rinse can help reduce mucus and flush out allergens from your nose
• Allergy shots (immunotherapy): a last resort treatment. These shots, administered by an allergist, gradually expose you to allergens to desensitise your immune system over time

Ultimately, the best approach for managing animal allergies may involve a combination of these methods, tailored to your specific needs and symptoms. Consult with an allergist or healthcare provider to determine the most suitable treatment plan for your situation. 

Your environment and dog allergies

Managing dog allergies involves reducing exposure to allergens in your environment and implementing strategies to control them. Studies have shown that rehoming pets is the best way to relieve allergy symptoms. However, when this isn’t possible, alternative methods can be used to help minimise allergic reactions.³

When you don't have a dog:³

• Keep a distance: avoid and minimise direct contact with dogs by refraining from petting or playing with them and visiting homes with dogs, if possible
• Preventative medication: if you anticipate coming into contact with dogs, start taking allergy medication a few weeks beforehand. This proactive approach may help prevent allergic reactions
• Be cautious with visitors: dog dander can stick to clothing and luggage. Even if your guests leave their dogs at home, they can still bring allergens, so be mindful of this when hosting visitors

When you already have a dog:

• Regular cleaning: dog dander can settle on surfaces throughout your home. Frequent cleaning is essential. Sweep and mop floors, vacuum rugs, and clean furniture regularly. Consider using a vacuum cleaner with a HEPA (High-Efficiency Particulate Absorbing) filter to effectively trap allergens
• Reduce allergen collectors: Minimise items that can collect dust and dander, such as carpets, rugs, and heavy drapes. Opt for easy-to-clean surfaces and furnishings
• Air filtration: Use a central air cleaner or install filters on vents to help remove allergens from the air. This can be especially useful if the dog is not allowed in certain areas of your home
• Keep the dog out of your bedroom: Since you spend a significant amount of time there, it's important to minimise allergen exposure in this area. Keep the bedroom door closed to limit allergen entry
• Control access to other rooms: Consider designating specific areas of your home as dog-free zones to reduce allergen exposure. Depending on your circumstances, consider keeping the dog outside when the weather permits

Remember that managing dog allergies often requires a combination of these measures. Consult with an allergist or healthcare provider for personalised advice and treatment options to help you better cope with dog allergies and improve your quality of life.³

FAQs

How common are pet allergies?

It's estimated that approximately 10–20% of people worldwide suffer from pet allergies. Moreover, the prevalence of allergic diseases has been on the rise globally. This underscores the significance of allergies as a major health concern and the need for continued research, prevention, and treatment efforts to address this growing public health challenge.¹

What should I do if I think my pet is causing allergies?

If you suspect that you have allergies to your pet, it's crucial to consult with a healthcare professional, typically an allergist, for an accurate diagnosis and appropriate guidance. Here are the steps to take:

• Consult your doctor: Schedule an appointment with your primary care physician or an allergist. Describe your symptoms and explain why you suspect they are related to your pet
• Allergy testing: Your healthcare provider may recommend allergy testing, which can include skin prick tests or blood tests. These tests can identify specific allergens that trigger your symptoms, including allergens related to your pet
• Accurate diagnosis: Based on the results of the allergy tests and a thorough assessment of your symptoms and medical history, your healthcare provider can make an accurate diagnosis and confirm whether you have pet allergies
• Treatment and management plan: If you are diagnosed with pet allergies, your healthcare provider will work with you to develop a personalised treatment plan. This plan may include medications, allergen avoidance strategies, and lifestyle adjustments to help you manage your symptoms effectively
• Follow medical advice: Adhere to your healthcare provider's recommendations and prescribed treatments. This may include taking allergy medications, implementing allergen-reduction measures, or considering allergy shots (immunotherapy) in severe cases
• Discuss pet care: Consult with your healthcare provider about strategies for managing your allergies while keeping your pet. They can offer guidance on pet-specific measures to reduce allergen exposure

Remember that self-diagnosis is not always accurate, and assumptions about pet allergies may lead to unnecessary actions, such as rehoming a beloved pet. A professional diagnosis and a tailored treatment plan can help you enjoy your pet's companionship while effectively managing your allergies.

Summary

Dog allergies don't have to mean the end of your relationship with your beloved pet. By understanding the allergens and following healthcare professionals' guidance, you can create a comfortable living environment that lets you enjoy your furry friend's companionship while managing your allergies effectively.

In conclusion, dog allergies are a common challenge, but with knowledge and the right strategies, they need not stand in the way of a fulfilling relationship with your canine companion. If you suspect you have dog allergies, consult a healthcare provider for guidance on diagnosis and management. With proper care and precautions, you can continue to experience the love and joy that dogs bring into our lives.