Took my chihuahua to the vet this week. He is 14 and has trachea collapse. When I got him ( i rescued him last year) they put him on an expensive medication for a cough. He was coughing continously, partially from stress. When i ran out of the meds from the vet, i put him on Mullein drops. Worked like a charm. The vet wanted to know how to spell it!! I told her why I switched. I hope she starts carrying it for other dogs with his symptoms. Now i have to find a herbal substitute for heart medicine because he has a heart murmur. $93 a month for a dog medicine. My heart meds are $39 for a three month supply!!