[quote1239295190=EsqCaucasians] Random vet? Surprised you don't know him. Dr. Greenfield, Animal Clinic Northview, is collegue of internationally known reproductive veterinarian Dr. Robert Hutchinson. [/quote1239295190] Perhaps I met him at a SFT symposium but there are hundreds of vets in SFT and thousands involved in small animal repro. Many of those vets even publish in various small time publications, I will admit some of those small time articles can be informative and entertaining but in the end I take them with a grain of salt. lynnicks don't get me wrong some of my best insight comes from rancher friends and fellow breeders although in the end I must fall back on evidence based medicine for the majority of my knowledge. Also, EsqCaucasians, you are right, gestation is 63 days post ovulation (ovulation is ~2 days post LH surge); however most of these averages come from historical studies in lab beagles and usually include +/-2 days. Recent research, (Eilts BE, Davidson AP, Hosgood G, Paccamonti DL, Baker DG. Factors affecting gestation duration in the bitch. Theriogenology. 2005 Jul 15;64(2):242-51. ) shows differences in gestation times in larger breeds (goldens, labs, GSD.) Although there is no research in giant breeds it would be interesting to see if variation from the average appears there as well. Does make you think about the timing in scheduled c-sections though. Robin