If you have used Benadryl for an allergy or itch yourself, it’s natural to wonder whether it might help your dog too. In this article The Labrador Site looks at whether dogs can take Benadryl safely. Giving you information on how much Benadryl to give a dog, how to work out the right dog Benadryl dose, and when it is the right time to speak to your vet. Benadryl For Dogs