according to veterinarians, the safe dosage of benadryl for dogs is 1mg per pound of body weight every 8 hours. the lethal dose of benadryl for dogs can vary depending on the size and weight of the dog. Generally, it is recommended to give dogs no more than 1mg of benadryl per pound of body weight every 8 hours. the lethal dose (ld 50) for diphenhydramine in dogs ranges between 24 to 30 mg/kg bw by iv administration, and death has been attributed to neuromotor excitement and.
