Dog Heat Cycle Stages Diagram — Proestrus, Estrus, Diestrus, and Anestrus - calculatorsfordogs.com

canine estrous cycle stages

Infographic illustrating the complete canine estrous cycle with all four stages: Proestrus (7-10 days) — swollen vulva and bloody discharge; Estrus (5-14 days) — fertile period with ovulation; Diestrus (~60 days) — corpus luteum phase or pregnancy; and Anestrus (3-5 months) — resting phase. Average total cycle is 6 months. Includes hormone level indicators (estrogen, LH, progesterone) and visual icons for each stage.