Some dogs develop allergies to common seasonal plants, like ragweed. But, unlike people, these allergies usually present as skin problems in dogs, according to Dr. Stephanie Janeczko D.V.M. in How Do I Know if My Dog Has Allergies?
“Because dogs with atopy [inhaled allergies] are frequently allergic to pollens and grasses, they often have a seasonality to their symptoms but can show signs all year long if they are allergic to something that is always in the environment (such as dust mites),” says Dr. Janeczko.