Frenzy*

To Photo: Oak and Niko. There are four stages to the canine estrus cycle (reproductive cycle)—proestrus, estrus, diestrus, and anestrus. Proestrus is the stage where the female’s estrogen level peaks. Proestrus lasts for, on average, 9 days. Males are attracted to her but she is not receptive to them. Estrus, which also averages 9 days, is the fertile period. Estrogen levels drop and proestrogen levels rise. More importantly, the female is receptive to males. Diestrus lasts for about 2-3 months or until theRead more