What Is A Progesterone Test For Canines? Canine progester one (cProg) is a steroid hormone secreted by the corpus luteum of the canine ovary, which plays an important role in the reproductive activities of female pets (such as ovulation, pregnancy maintenance, delivery, breast development, etc.). The progesterone test is a qualitative test, which is com help you determine the best mating date for your canine. If this is combined with observing the behavior around the sexually active male canine, the probability of pregnancy failure will be minimized. Moreover, the results of the test are displayed in a numeric format, which means it is understandable to all breeders. Canine progesterone absolutely recommend this test to everyone who is considering mating their female canines.