Changes

** Increase in cell numbers in the [[Female_Reproductive_Tract_-The_Vagina/Vestibule_-_Anatomy_%26_Physiology#Vagina_2|vaginal]] epithelium.

** Increase in cell numbers in the [[Female_Reproductive_Tract_-The_Vagina/Vestibule_-_Anatomy_%26_Physiology#Vagina_2|vaginal]] epithelium.

** Superficial layers become cornified.

** Superficial layers become cornified.

* The '''bitch''' shows external evidence:

* The '''[[Female_Reproductive_Tract_-Oestrous_Cycle_-_Anatomy_%26_Physiology#Bitch|bitch]]''' shows external evidence:

** Vulval oedema

** Vulval oedema

** Hyperaemia

** Hyperaemia