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Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern about Poochie.
In my experience, dogs who have been diagnosed with bronchitis will often have flare-ups and/or the disease can progress in which case additional drugs are necessary. Those additional drugs might include cough suppressants, brochodilators and often antibiotics since there can frequently be a secondary bacterial component to this condition. These additional drugs are ones which can be discussed with your vet but for now, I do have an over the counter, human drug that's a cough suppressant which will be acceptable to give her.
The dose would be 0.25 to 1 mgs per pound of body weight 2-3 times a day. You just want to double check labels and ensure that the formulations only contain this ingredient although inclusion of Guaifensin is fine.
I hope this helps, Deb