How many benadryl 25 mg tablets can you give your 30lb dalmatian?

Dogs can be given one milligram for every pound of weight, of regular strength Benadryl every 8-12 hours. For a 30 pound dog, you can try one 25mg tablet twice a day, to see if the slightly lower dose controls your dog's symptoms. You could also use Children's liquid regular strength Benadryl. Notice I say "children's", regular liquid Benadryl! Regualr liquid Benadry has too high an alcohol content to be safely used for animals.