Canine hemangiosarcoma is a disease of extremes: staggeringly swift and almost uniformly fatal. Accounting for about 7 percent of all forms of cancer in dogs, this highly aggressive sarcoma arises from cells that line blood vessels. It occurs most commonly in the spleen, but can also appear in the heart and the subcutaneous tissue. Middle-aged and senior large breed dogs, especially German Shepherds and Golden Retrievers, are its usual victims.
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via Whisker Therapy