(Mаrquаrdt) Yоu hаve recently remоved a mass frоm the left flank of a dog. The histopathology report diagnoses a melanoma. The pathologist describes a mitotic index of 4, nuclear atypia of 30%, and relatively poor pigmentation. True/false: because this is a melanoma of haired skin, its behavior should be benign. No further staging or treatment is warranted.