If a Puppy has flea allergy dermatitis, it means it’s allergic to flea saliva. Pollen and mold are two common environmental allergens that also have an effect on dogs—commonly seasonally. resources/utilization: https://barryvdgu014749.blogsumer.com/28650028/what-does-what-does-it-mean-when-a-bird-poops-on-you-mean