We ultrasonographically evaluated the prenatal development in cats, from the early phases to Day 30 of pregnancy, subjecting a group of pregnant cats (n = 12) to a daily ultrasonographic exam. The ultrasonographic images allowed us to measure the minor diameter of the gestational sac and the crown-rump length of the embryo/fetus. Ten subjects underwent ovariohysterectomy at specific intervals during the pregnancy, with the aim of comparing the ultrasonographic data with real data; only two subjects brought their pregnancy to term. The earliest ultrasonographic observation of the gestational sac was on Day 10 after mating, while the embryo could be measured only beginning with Day 18. This study allowed to gather useful new data in order to clinically monitor the normal course of pregnancy in cats and to date the gestational age.
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