i have been hitting him with a monthly flea and tick treatment. i started on 50mg of antihistamine last night. i have done a lot of research and for a 70lb dog 50 mg every 12 hours seems to be acceptable. is there anything more i can do? is this a proper dosage for the diphenhydramine hydrochloride? how many days should i try this to see if it is just an allergy? lastly, i have been using rubbing alcohol on his open wounds, is this ok? i really appreciate your help, thank you so much!