If this is a sudden onset allergic reaction the best thing to do is take this dog to be examined by a veterinarian. Injectable Benadryl and steroids if needed are the fastest and most effective treatment for an acute allergic reaction. Benadryl will be followed up at home at a dose of 1 milligram per pound of body weight given orally three times a day for 2 days. Do not use the Cold and Sinus variety only plain Benadryl is safe.
If this is a chronic problem with allergies she should be examined by your veterinarian so a long term treatment plan can be established. Treating mild-moderate allergies involves anti-histamines, frequent bathing, food trial, omega-3 fatty acids, and treating secondary infections. More serious allergies are treated with additional medication--steroids, allergy shots, and immune modulating medication.
If this is a chronic problem with allergies she should be examined by your veterinarian so a long term treatment plan can be established. Treating mild-moderate allergies involves anti-histamines, frequent bathing, food trial, omega-3 fatty acids, and treating secondary infections. More serious allergies are treated with additional medication--steroids, allergy shots, and immune modulating medication.