Our Boston was diagnosed with 3rd stage high grade metastatic mast cell tumors

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I know how you feel.  Just lost one of mine to cancer and miss him every day.   But he had hemangiosarcoma and the prognosis was terminal from the start.  We didn't bother with chemo which would have just made him sick.  We had the surgery to have his spleen removed after the tumor burst which is when the biopsy was taken.  He had 3 months of being his old self, then one day it was over.  Another tumor had ruptured and he was bleeding internally.  We knew it was coming and we let him go.  I won't tell you it was easy.