![]() They can smell her pheromones (hormone-like scent chemicals) for miles - literally. The female is fertile and receptive to the male only during the middle part or estrus, despite the fact that she is attractive to the male throughout the entire cycle. Each part lasts about seven to nine days on average. That’s why dogs who have had complete ovario-hysterectomies (complete removal of ovaries and uterus) are not likely to need hormone replacment therapy.Įach cycle consists of three parts: the "coming-in", the "being-in", and the "going-out", also known as pro-estrus, estrus and metestrus. As far as female hormones go, they aren’t producing any more than a neutered male dog during these quite periods. For ten months out of the year, the average female dog’s ovaries are pretty much shut down. They have two cycles that last about a month, about six months apart. That might make you think their cycles are six months long, but they’re not. Most female dogs have two estrous cycles yearly. ![]() Of course, there are definitely folks who just don’t understand what’s going on in the first place. If the boys don’t dig in, the girls may dig out. They knew the dog was in "heat" (estrum), but they underestimated the sex drive, which is a mistake. There is no telling how many times that little conversation has played out. "But… but… I just let her outside for a minute!" "Didn’t have your shoes on, did ya?"
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