Hi- my doggie is coughing constantly and deeply. I got a lung and heart X ray 10 months ago and it was clear- no problems. I got a valley fever test and came back no problems- she does not have valley fever either. I tried allergy medicine, and it seemed to help for a while. However, under the same allergy meds, even with increased dose, the cough is back. She coughs so hard she throws up bile sometimes. I am not sure it was allergies. What are the other possible options for why she is coughing like this? What would you do?