I agree with the other responses. Echinacea is not an appropriate choice for allergies...perhaps freeze dried stinging nettle but while there are other herbs I might suggest for allergies, an herbalist or similarly trained practitioner would need more information to evaluate the cause to suggest remedies for your dog's individual physiological make up. Diet is the main area I would look to discover sources of allergens followed by prior vaccine history and current vaccination practices.
Alicia North, Herbalist
Beloved Adelaide Von Barren Berg 10/14/98-1/17/10
Holding you in our hearts, forever!