I have had good luck with tetracycline. It is mainly used for bacterial infections in cattle. I measure the dosage same as on the pack. I like the pills but the powder mixed in water works the same. It doesn't cure the kennel cough but helps to keep it from dragging on past 1-2 weeks. You can get it at the local farmers co-op or Tractor supply. You can also get the Kennel Cough preventive there also.