How Long Before Benadryl Works On Dogs Before A Vaccine?
How Long Before Benadryl Works On Dogs Before A Vaccine? To mediate vaccine reactions, veterinarians often recommend administering Benadryl 2-4 hours before the vaccine appointment to prevent reactions such as hives or swelling of the face. Does Benadryl help with vaccine reactions in dogs? Mild vaccination reactions in pets such as fever, swelling, and soreness