* Lymph from the caudal abdominal mammary complex may also drain into the '''medial iliac''' lymph nodes.
* Lymph from the caudal abdominal mammary complex may also drain into the '''medial iliac''' lymph nodes.
* '''Interconnection''' between left and right superficial inguinal lymph nodes.
* '''Interconnection''' between left and right superficial inguinal lymph nodes.
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== Complications ==
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* Changes characteristic of the cycle of the bitch include growth and proliferation of the mammary gland with each cycle even if the bitch does not conceive.
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* Frequent proliferation and subsequent involution predisposes the bitch to mammary tumours.