The objectives of the present study were to gather data on the prenatal development of Turkish cats (the Angora and Van cats) and examine the effects of the breed on prenatal development. Three Angora and four Van cats, ranging in age from 3 to 4 years, were used in the present study. Depending on the stage of pregnancy, the gestational sac diameter (GSD), the fetal heart diameter (FHRTD), the fetal abdominal diameter (FAD), the fetal head diameter (FHD), the fetal gastric diameter (FGD), the fetal width of fore (FWFP) and rear footpads (FWRP) were measured by freezing the images of the fetus or fetal structure on the screen. The mean FHRTD value of the Angora cats was significantly (P = 0.033) greater than the corresponding value of the Van cats during the third week of gestation. The Van cats had significantly (P = 0.008) greater mean value of FHD than did the Angora cats during the fifth week of the gestation. There were no significant breed differences between the other fetal measurements. As a result, the prenatal development of the Angora and Van cats were found to be similar. The findings of the present study may also be used as an aid to estimate the gestational age of domestic cats.