It’s not just the shampoo, or just the food, or just the supplements, or just the over the counter medications, or just the prescribed medication, or just the allergen specific immunotherapy.
Allergies are very complicated, that’s why it is best to spend the money on a consult with a veterinary dermatologist, if it’s been going on for more than 1 year/4 seasons you are just spinning your wheels trying all these different things. Meanwhile, the dog is uncomfortable, possible suffering.
Peace out.
PS: My dog is bathed twice a week in conjunction with allergen specific immunotherapy.
They still have occasional flare ups. Treatment tends to be lifelong.
