There are a variety of environmental allergy-producing triggers that can affect dogs. Common culprits include grass and weed pollens, certain trees and flowers (particularly those categorized under the lily family), mold spores, bottlebrush plants, dust, flea bites and more.
With spring in full swing, these environmental triggers are much more prevalent during your daily walks or in your backyard. As they breathe in pollen or play and lie in the grass, allergies can ensue.