Give them a go!
I was sceptical reading the reviews, as my dog has been diagnosed with bronical lung and on steroids, but he still has this hacking cough. I purchased some Lignosus, within a few days, his breathing was easier and the hacking cough had reduced significantly. My dog looked happier being able to breathe a bit easier, reducing his cough. But then January came, and short of money, I allowed the Lignosus to run out and my dog is back to his terrible hacking cough. So I am back to order more.