The dose of benadryl is 0.5 mg per pound of body weight or 1.25 mg per kilogram of bodyweight. The dose of 1100 pound horse will be 550 mg. You can repeat the dose after 4-6 hours. But the daily dose should not exceed the 3000 mg per day.
How Much Benadryl Do You Give A 1100 Pound Horse?
