Hi Brett,
No, I haven't used that formula. My take is it tries to be everything to everyone, with moistening herbs, anti-Phlegm herbs, heat-clearing herbs, Wind expellers and astringents. Bound to be some conflict somewhere among those ingredients, or at least some inappropriateness to a given patient. It's true that in humans, very chronic coughs can have elements of dryness, tenacious Phlegm, excess coughing that damages Qi, and lingering inflammation, so I guess it has its applications. For a dog to benefit from this formula, that's how they'd have to look: phlegmy, Yin deficient, protracted coughing, with a sore throat and or/Wind Heat invasion.
When we look at the points, the story your patient is telling is Shao Yang disharmony (GB25), leading to Wind (BL 13) Damp invasion (LV 13), possibly with Kidney deficiency (GV 3). Or the latter can just be helping with the nosebleeds by internalizing Yang. If you were to continue some form of Minor Bupleurum, I suppose the Qing Fei Tang might eventually help, but it doesn't seem as on point as Minor Bupleurum (or even Chai Hu Jia Long Gu Mu Li Tang) plus San Ren Tang. In theory, based on your points, the latter duo should address:
- megaesophagus
- epistaxis (CHJLGMLT is one of my favourites for this)
- pneumonia
Qing Fei Tang would not likely help a lot with megaesophagus anyway, and expends effort where you may not need it, diluting out the herbs that might help a lot.
So, that's my take, but I'm willing to be taken to school! If you use Qing Fei Tang, let us know how it goes!
Steve