My heart goes out to you. Unless it is an immediate life and death situation, I would not recommend chemo. Chemo destroys the body and severely compromises an already weakened immune system. What stage is his cancer?The only reason I would ever consider chemo would be in a life and death situation where I would need to buy time in order for natural alternatives to work. Let me point you to the following anti-cancer protocols for dogs that includes cancer fighting and immune strengthening supplements:
With regard to his not eating at times, could it be because raw food was introduced too quickly? Sometimes a slow transition is necessary in order for our furkids to become accustomed to it.