After years of my Yorkie suffering from seasonal allergies, finally I found the answer. The vets now have a miracle injection that is NOT a drug per se with no side effects. It is called cytopoint. It lasts 8-10 weeks and it really works. Also, recently, before I went to have this injection, my Yorkie passed out from choking on his phlegm. It has solved that problem too; however, before I could get him to the vet that Monday morning, I gave my Yorkie a combination of unfiltered coconut oil and cinnamon in his food. Cinnamon is a natural spice that breaks up phlegm. My vet told me to keep giving it to him.