I’m seeing more of these “automatic ovulation detectors” being advertised for dogs, so I want to clear up some confusion before anyone wastes money or misses a mating. These handheld probes do not detect ovulation. Ovulation in the bitch is driven by hormonal changes (progesterone rise). It cannot be accurately identified by measuring vaginal moisture, conductivity, resistance, or “numbers on a screen”. Those values can change for many reasons — discharge, irritation, probe p