oh and he has a bad tumor on his right paw =(
I am very sorry about your dog!
Mast cell tumor is not contagious to humans or other animals. So you need not worry about that.
The newest non-experimental mast cell tumor chemotherapy agent is Palladia.
I see that you live in NJ. Red Bank Veterinary Specialists has a veterinary oncologist on staff who can evaluate you dog and see if Palladia or other chemotherapy agents are the right choice for him.
If he is not a suitable match for Palladia, there are some effective holistic chemotherapy agents that may help. These include: Neoplasene, Thymic Extract, Chinese Herbal Medications and many others. My practice uses these holistic chemotherapy agents as do many other integrative practices. We have found that they are effective in many cases.
To search for a practice that uses an integrative approach in your area please check the American Holistic Veterinary Medical Association, or TCVM.com's websites or do a google search.