Hi there,
We've used Xue Fu Zhu Yu Tang for oral tumors as well, which counts as the upper burner. I just prescribed it myself a few minutes ago for a squamous cell carcinoma in a cat. So I'd go ahead and try it and see what happens. The only risk with the formula (aside from it not working) is in creating loose stools if the dog has a tendency to Spleen deficiency and Damp accumulation. If that isn't part of the history, I'd give it a try, pending more data on pulses, tongue, and active points.
Good luck and all the best!
Steve