Itching in dogs: causes and treatment options

Introduction

Pruritus, or itching, is a common problem in dogs and can have various causes. In this article, we will examine the most common causes of pruritus in dogs and explain how to diagnose and treat them.

Persistent itching can be very unpleasant for our four-legged friend and requires a thorough examination and solution.

A deeper understanding of scratching

How often and why does a dog scratch itself? Scratching, biting, and rubbing are natural behaviors in dogs for grooming or to relieve social stress. However, if the scratching becomes so intense that the dog develops bald or even bloody patches, it is essential to consult a veterinarian.

To understand if the itching is genuine, observe when and where your dog scratches. If he only scratches when resting and stops as soon as he's distracted, it could be actual itching. However, if the scratching starts suddenly when you ask him to do something or when other dogs are around, it could be a stress reaction.

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Common causes of itching in dogs

Itching in dogs is a symptom that can have numerous causes. Some of the most common reasons for itching in dogs are:

1. Fleas
2. Mites, such as harvest mites, mange mites, hair follicle mites or ear mites
3. Insect bites
4. Fungal infections
5. Ear infections
6. Dry, flaky, or inflamed skin due to other skin conditions
7. Overfilled or inflamed anal glands
8. Allergies to environmental allergens such as house dust mites
9. Food allergies
10. flea saliva allergy
11. Contact allergies

You should have an experienced veterinarian determine the exact cause of the itching. They can examine the affected areas of skin and perform allergy tests to identify the cause of the itching.

Common causes of pruritus/itching in dogs in detail

Allergies

Allergies are one of the most common causes of itching in dogs. These include:

• Food allergiesThese occur when the dog is allergic to a specific ingredient in the food. Symptoms can include itching, skin changes, and gastrointestinal problems.
• Environmental allergiesThese are allergic reactions to environmental factors such as pollen, mold, or house dust mites. The symptoms are similar to those of a food allergy and can include itching, skin changes, and breathing problems.
• flea saliva allergySome dogs are allergic to flea saliva, which leads to severe itching and skin changes.

Parasites

Parasites such as fleas, ticks, mites, and lice can also cause itching in dogs. Examples of parasitic skin diseases include:

• Sarcoptic mangeCaused by the Sarcoptes scabiei mite, it leads to severe itching and skin changes, especially on the elbows and tarsi.
• DemodicosisCaused by the Demodex canis mite, it can cause itching and skin changes, especially if a secondary bacterial infection is present.

Infections

Skin infections caused by bacteria or yeast can also cause itching and skin changes. Examples include:

• Bacterial pyoderma: A bacterial infection of the skin that leads to pustules, crusts and itching.
• Malassezia dermatitisA yeast infection of the skin that leads to itching, redness, and scaling.

Diagnosis of pruritus/itching in dogs

Diagnosing pruritus in dogs requires a thorough medical history and examination of the skin lesions. This may include:

• Cytological examinations: A microscopic examination of skin samples to identify bacteria, yeasts, or inflammatory cells.
• Skin scraping: An examination of skin samples to identify parasites such as mites.
• Allergy testsSkin or blood tests to determine allergies to certain substances.

Relief from itching in dogs

Several options are available to relieve the itching, including:

• Local treatment of the skin with supportive skincare products (shampoo, lotion, spot-on).
• Supporting skin healing through dietary supplements, e.g. anti-inflammatory essential fatty acids or immunomodulating additives such as colostrum.
• Systemic treatment with medication prescribed by a veterinarian (e.g., cortisone).
• Local treatment of the skin with medication prescribed by the veterinarian.
• Ignore the scratching.

Appropriate skin care and optimal nutrition can also improve the skin condition and relieve itching.

The distinction between normal and pathological scratching

Every dog scratches itself occasionally; this is part of normal grooming or serves to relieve social stress. However, if the dog scratches and nibbles to the point of developing bald or even bloody patches, this is a reason to consult a veterinarian.

Treatment of chronic pruritus/itching in dogs

Several treatment methods should be considered when dealing with itching or pruritus in dogs. Here are three common approaches:

1. Local therapy for itching in dogs:

This treatment typically involves the application of creams, ointments, or shampoos designed to relieve itching and treat any skin infections. For example, a veterinarian might recommend a medicated shampoo containing ingredients such as chlorhexidine (to fight bacteria), ketoconazole (for fungi), or oatmeal (to soothe the skin). Creams and ointments may contain topical steroids, antihistamines, or local anesthetics to relieve itching.

2. Systemic therapy for itching in dogs:

This treatment may include orally administered or injectable medications that work systemically to combat the itching. These may include steroids, antihistamines, or immunomodulating drugs such as cyclosporine or Apoquel. In some cases, antibiotic or antifungal therapy may also be necessary to treat secondary skin infections.

3. Allergen-specific immunotherapy (ASIT) for itching in dogs:

This approach is chosen when the itching is caused by an allergic reaction. After the specific allergen (or group of allergens) has been identified, the dog receives a series of injections containing small amounts of the allergen. The goal is to desensitize the dog's immune system and reduce its reaction to the allergen. This process can take several months and requires careful monitoring and adjustments by the veterinarian.

It is important to emphasize that the choice of treatment method depends on the underlying cause of the itching, the dog's overall health, and other factors. Therefore, the decision should always be made in consultation with a qualified veterinarian.

The treatment of pruritus in dogs depends on the cause. While parasites and infections are relatively easy to diagnose and treat, environmental allergies require more in-depth investigation.

Diagnosis of environmental allergies in cases of itching in dogs

Diagnosing an environmental allergy requires a careful and systematic approach. A thorough examination of the animal's skin and environment can provide helpful information. Allergy tests, such as intradermal or serological tests, can also help determine the exact cause of the allergy. It is important to note that these tests are not always reliable and can sometimes produce false-positive or false-negative results. Therefore, the diagnosis of an environmental allergy should always be made in conjunction with the animal's history, clinical symptoms, and response to treatment.

Treatment of environmental allergies

The treatment of environmental allergies in dogs aims to reduce the allergic reaction and alleviate symptoms. This may include the following measures:

1. Allergen avoidanceIf the cause of the allergy is known, contact with the allergen should be avoided as much as possible. This can be achieved by vacuuming regularly, cleaning dog beds, and avoiding certain plants or chemicals.
2. Drug therapyAntihistamines, corticosteroids, and immunomodulating medications such as cyclosporine or oclacitinib can be used to relieve itching and inflammation. The dosage and duration of treatment should be individually tailored and monitored by a veterinarian.
3. Topical therapyMedicated shampoos, creams, or sprays can help relieve itching and inflammation of the skin. Regular use of moisturizers can also help strengthen the skin barrier and prevent future allergic reactions.
4. HyposensitizationFor some dogs, hyposensitization therapy (also known as allergy shots) can be helpful. This involves gradually accustoming the dog's immune system to the allergen in order to reduce the allergic reaction. This therapy can be lengthy and requires patience and commitment from the owners.
5. Support measuresA balanced diet, regular exercise and stress reduction can improve the dog's overall well-being and help alleviate the symptoms of an environmental allergy.

Conclusion on itching in dogs

Pruritus/itching in dogs can be caused by a variety of factors, including environmental allergies, food allergies, parasitic infections, and bacterial or fungal skin infections. A thorough history, clinical examination, and targeted diagnostic tests are necessary to identify the underlying causes and initiate appropriate treatment. Successful management of environmental allergies in dogs often requires a multimodal approach, including allergen avoidance, medication, topical therapy, desensitization, and supportive care.

The collaboration between veterinarians, pet owners and, if applicable Specialists in veterinary dermatology Early diagnosis and treatment are crucial to ensuring optimal care for dogs with environmental allergies. They can help improve the animal's quality of life and reduce the risk of secondary infections or chronic skin problems.

Research into environmental allergies in dogs remains an important topic in veterinary medicine, as new insights into the pathogenesis, diagnosis, and treatment of these diseases can contribute to improving the well-being of affected animals. Future studies could focus on identifying risk factors for the development of environmental allergies, exploring new diagnostic methods, and evaluating innovative therapeutic approaches.

Improved knowledge of the mechanisms that trigger environmental allergies in dogs, as well as a better understanding of the factors that influence the response to treatment, can help to develop tailored therapy plans for affected animals and enable effective prevention and control of environmental allergies in the dog population.

Further resources on the topic

1. Olivry, T., Mueller, RS, & Prélaud, P. (2015). Criteria for the diagnosis and treatment of dogs with atopic dermatitis. Veterinary dermatology, 26(1), 1-e2.
2. Nuttall, T., Uri, M., & Halliwell, R. (2013). Pruritus in dogs: a literature review. Veterinary Dermatology, 24(1), 75-e22.
3. Hensel, P. (2017). Parasitic itching in dogs and cats: an overview of current treatment approaches. Small animal practice, 62(5), 268-281.
4. Marsella, R., De Benedetto, A. (2017). Atopic dermatitis in animals and humans: An update and a comparison of the disease. The Veterinary Journal, 221, 9-18.
5. Noli, C., & Scarampella, F. (2014). Skin diseases in dogs and cats: from diagnosis to therapy. Veterinary Clinics of North America: Small Animal Practice, 44(3), 507-524.

Please note that all information from the sources mentioned above is current at the time of writing. It is recommended to always consult the latest research and, if necessary, to consult a veterinarian or animal health professional.