Hi there --
Welcome to Just Answer.
How much doea your dog weigh?
You can give up to 70 mg every 8 hours.
as the recommeded dosage is up to 1 mg per pound every 8 hours.
Thank you so much
You are most welcome. If benedryl does not work -- there are other antihistamines that can be used in dogs -- please ask your regular vet for recommendations.