The Estrus Cycle The canine estrus cycle has four stages: Proestrus: The beginning of heat lasts between 7 and 10 days. During this time, the vulva begins to swell and your dog begins to bleed.

False pregnancy in dogs is caused by normal hormonal changes that begin after every estrus cycle. The purpose of this change is to prepare your dog’s body for pregnancy.

Estrus synchronization is a game-changer for beef producers aiming to tighten calving windows, improve artificial ...