* '''Afferent lymphatic ducts''': pass dorsocaudal to reach the mammary lymph nodes (superficial inguinal).
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* '''Mammary (superficial inguinal) lymph nodes''': two nodes at the dorsocaudal side of the udder. Usually a palpable large, kidney-shaped node between the caudal side of the udder base and the thigh.
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* '''Efferent lymphatic ducts''': pass into the abdomen through the inguinal canal to empty into the deep inguinal node.
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* '''Deep inguinal lymph node''': small, dorsocaudal udder. Too deep to be palpated.