I could care less about American Hefeweizen. Make a seperate article, this is about Hefe in general. I'd like to add Granville Island Breweries to the list, but lo and behold, it's a list of American brands, and GIB is Canadian. Go figure.
The standard dosage for oral Benadryl is 1 mg per pound of body weight, given 2-3 times a day. Most drug store diphenhydramine tablets are 25 mg, which is the size used for a 25 pound dog. Always double check the dosage before giving an over the counter medication. In addition, many formulations are combined with other medications such as Tylenol so make sure Benadryl tablets contain only diphenhydramine.
But there are other questions you should ask your vet: how much Benadryl can I give my dog, and is Benadryl safe for dogs. The general guideline for how much Benadryl can I give my dog is 1mg of Benadryl (diphenhydramine) for each pound of body weight, 3 times per day (which means every 8 hrs).