Dear Friend:
I gave my dog Essiac or Ojibwa tea (goes by both names), and she gets over whatever is troubling her. I use Miracle-Mineral-Supplement daily in my water, also.
I would call Chris, at http://www.plantcures.com,
they use Ojibwa and bloodroot tincture for humans cancers...
Check him out and see what he says. The other thing I have heard is the Budwig protocol has a pet plan...:)http://www.healingcancernaturally.com/pet-cancer-cure-testimonials.html
So you might look that up, also, and see what's doable.
I would definitely give your dog natural foods, no chems at all. And Alkaline Water if at all possible. You can buy alkalizing drops at the health store, also.
If you give doggie alkaline water, natural foods plus an anti-cancer supplement or plan, it honestly should do well.
Marilyn