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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
It sounds like they are treating with everything at their disposal. The only other suggestion would be to consider placing a tracheal stent. This is the only "cure' we have for the condition. It's placed in the trachea to open the airway and allow more normal respirations. It's pretty expensive due to the limited availability of vets who can perform it, but it's an option.
As an expectorant, I would go with Robitussin DM. This is safer, as it doesn't have a decongestant that can be toxic. The dose of Robitussin DM in this small dog would be 1/4 teaspoon 2-3 times daily, as needed.
I hope this helps, let me know if you have any other questions.