|Proestrus||Vagina is gaping and the tissues are moist and reddish-pink.|
There are numerous longitudinal folds or striations visible on the dorsal and ventral lips.
|Estrus||Vaginal appears similar to that seen at proestrus, but the tissues are lighter pink and less moist.|
The striations are more prominent.
|Metestrus 1||Vagina tissues are pale and dry.|
The dorsal lip is not as oedematous as in the estrus
|Metestrus 2||Vagina appears similar to that seen at Metestrus 1, but the lip is less oedematous and has receded.|
Whitish cellular debris may line the inner walls or partially fill the vagina.
|Diestrus||Vagina is moist and has a small opening and the tissues are bluish-purple in colour.|