Thank you so much for your answers!
We live in the countryside in a low energy house equipped with air filters. Air in house should be clean and "better quality", but maybe this filter system does not suit her? However, perhaps changing her mattresses and blankets more frequently could help.
Happy birthday to Topper, we wish he will stay happy and in a good shape for a long time!
Our basenji Rairai started with heart problems and her cough was supposed to be due to enlarged heart. We started all these different medications (one of them is diuretic) and they helped for a while. But then she started coughing again, and this time the diagnosis was chronic bronchitis. The heart problem should be under control now.
I was thinking about some products that could help her breathe more easily, but I have not found any. The vets here seem to "know" only cortisone… I would like to find a softer and more natural medication.
Thank you for sharing your ideas with us, knowing that we are not alone with this problem helps already a lot.