Soft-tissue sarcomas in dogs often begin as small nodules under the skin that can feel hard or soft, depending on location and surrounding structures, writes veterinarian Karri Miller, a board-certified oncologist. A definitive diagnosis can only be made with a fine needle aspirate and cytology of the mass. Treatment usually consists of surgical removal followed by radiation or chemotherapy, and Dr. Miller recommends all lumps on pets be evaluated by a veterinarian.

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