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=== Pro-Oestrus ===
 
=== Pro-Oestrus ===
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* The phase immediately preceding oestrus.
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* Marked increase in reproductive activity.
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* Follicular growth and regression of the corpus luteum of the previous cycle (in polyoestrous species).
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* Uterus enlarges slightly
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* Endometrium becomes congested and oedematous, glands show secretory activity.
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* Vaginal mucous becomes hyperaemic.
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** Increase in cell numbers in the vaginal epithelium.
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** Superficial layers become cornified.
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* The bitch shows external evidence:
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** Vulval oedema
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** Hyperaemia
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** Sanguinous vulval discharge
    
=== Oestrus ===
 
=== Oestrus ===
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