We will conclude our series on allergies with Atopy or inhalant allergies. After Flea Allergy Dermatitis, Atopy is the second most common cause of skin allergies in dogs. Atopy occurs when your pet comes into contact with with allergens in the environment. It also tends to occur seasonally. Unfortunately management of this type of allergy can be difficult and usually requires lifelong therapy.
When your dog comes into contact with an allergen, the dog's immune system will overreact. This will result in itchiness which can be localized or over the entire body. Common allergens can include:
The symptoms of atopy usually begin relatively early in life, many times as early as one year, and start out as seasonal. Most dogs will show signs in the summer when airborne allergens are in higher concentrations. As an atopic dog gets older they tend to become allergic to more substances and their symptoms tend to become less seasonal as well. Eventually, their itchiness can occur year-round.
Dogs with atopy are usually itchy, particularly the feet. The skin may be red and irritated due to scratching, and the ears may also be inflamed. About half of all allergic dogs suffer from ear infections and this may be the only symptom. The symptoms of food allergy are difficult to distinguish from those of atopy. Signs to look for are:
Laboratory tests can help in the diagnosis of allergies. Some allergy tests look at the blood serum, the part of the blood that has no red blood cells. High levels of Immunoglobulin E suggests your pet is allergic or has a parasitic infection that is causing an allergy-like response.
Another serum test - radioallergosorbent serum test or RAST - identifies reaction to specific antigens, like fleas and pollens. Interpreting the RAST test is difficult because there is no direct correlation between what your pet’s blood reacts to and the degree to which your pet exhibits symptoms. This is because allergies are caused by a complex interaction of many factors, not just the antibodies your pet makes that can be measured in a test. Another clinical test for allergies is the intradermal skin test. With skin testing, small amounts of the possible allergen are injected into a shaved area of the skin. If your pet has a reaction with increased blood flow and histamine release, there will be a spot of red, raised, puffy skin around the injection site. As with the RAST test, there is no clear correlation between skin test results and your pet’s reaction to the material in everyday life. These tests are used as indicators of what your pet should avoid, but not as definitive diagnoses.
Treatment depends on the severity of the problem and the length of the dog’s allergy season. Avoiding the allergen is the most effective, however this is often impossible. Treatment includes:
Your Vet will be the best person to determine both the type of allergy and treatment for your pet.
Karen is the owner of Karen's Canine Kitchen. She is passionate about helping her customers select the best products so their pets can live happy, healthy lives. Karen and her husband have three rescue dogs of their own.