What is atopy (allergies in dogs)

Atopy is a type of allergic reaction in dogs. When a dog has atopy, its immune system overreacts to certain substances in the environment, like pollen, dust mites, or mold spores. These substances are called allergens. Normally, allergens are harmless, but in dogs with atopy, the immune system mistakenly thinks they are dangerous, leading to inflammation and itchiness in the skin.