Hi Shelley,
Thank you for your question.
Allergies are really difficult to work through like your experiencing right now. You need to have a good working relationship with your vet and be ready for a lot of trial and error. Be sure to read the instructions thoroughly on the use of antihistamines for dogs on our website and how to determine if they are working for their allergies or not.
I hope this helps.
Dr. Clayton Greenway