There are different ways to treat grass allergy in dogs. Most vets prescribe antihistamines, corticosteroids, and topical gels or creams. Some vets also prescribe medicated shampoos to decrease itching in dogs.
However, these treatments sometimes do not work and have side effects.
Looking at natural supplements like CEN Digestive + which helps the immune system health through the promotion of a healthy gut. The microbiome environment can be affected by stress or medications and this has an impact on the immune system.