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@Susan Capuano, I went to 3 or 4 vets, they all said it was too late. All they offered was comfort meds, tramadol, rimadyl, neurontin etc. She had 1 month left, period.
Hemangiosarcoma is a very aggressive form of cancer, it often shows no symptoms till it has metastasized.
Dogs tend to be stoic and hide pain, in the wild being sick is a weakness they can't afford, because the pack members will turn on them. This dog was walking 5 miles a day with me up until a month before she died. She never had so much as a cold before this thing struck at 9 years, 8 months. She was a beautiful Welsh Pembroke Corgi.
I'm sorry for your loss.