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"A mast cell tumor usually shows up as an isolated lump or mass, although they can appear in clusters or in multiple areas of the skin. Most affected dogs show no symptoms of irritation or illness. Owners of dogs with mast cell tumors may notice one or more of the following:"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Mast-Cell-Tumors/Symptoms.aspx>