My nova scotia duck tolling retriever has been coughing on and off for years. Sometimes it brings up phlegm; other times not. We know she has allergies to ragweed, grass, weeds, flaxseed. Her food contains nothing that she's allergic to. I understand that her allergies may act up in the summer, but her coughing is year-round (we live where we have winter from Nov.-Mar. so the grasses are dead part of the year). They have diagnosed her with pneumonia and found a shady spot on her lung (our vet thinks this may be scar tissue from a previous bout of pneumonia). We got her from a shelter (a stray), so we do not know her background. Any suggestions on holistic remedies I can try, or other recommendations of what to consider? She also has frequent infections in one ear. Thank you!!