Lab dogs are usually carbonic type in homeopathy, they could have chronic bronchitis worsened by cold humidity.
I suggest: Calcarea carbonica 15CH, 3 granules once a week and Coryzalia ( Made by BOIRON), one tablet 3 times a day.
These products can be found in drugstore. Coryzalia can be replaced by
any other homeopatic product used for human bronchitis.
Dr.Paul Guindon DMV
Clinique veterinaire Salaberry
Medecine conventionnelle et holystique
1895 Salaberry, Montreal, QC