An allergy test for dog Dander can be done in two ways. One is a skin test and the second involves taking a blood sample and checking for allergen-specific IgE (immunoglobulin E). Dander consists of animal skin cells and other particles shed by dogs. The IgE tests, check the level of allergen present in the body. Whether it's zero, low or high and on the basis of this, the treatment is suggested. Skin tests give instant results. These tests determine whether the allergy is due to dog Dander or anything else like pollen and mold carried by dogs.