* Frequent proliferation and subsequent [[Lactation_-_Involution_-_Anatomy_%26_Physiology|involution]] predisposes the bitch to [[Neoplasia - Pathology#Examples of Tumour Types|mammary tumours]]. | * Frequent proliferation and subsequent [[Lactation_-_Involution_-_Anatomy_%26_Physiology|involution]] predisposes the bitch to [[Neoplasia - Pathology#Examples of Tumour Types|mammary tumours]]. |