Gestacional Period Estimated age (days) Number of samples Crown-rump (mean) Embryonic 19 1 6 mm 22 2 10 mm 27 4 16 mm ±1.41 32 2 23 mm ±1.41 Fetal 40 8 49.62 mm ±2.50 44 23 68.30 mm ±4.64

Table 1: Data collected from embryos and fetuses of dogs without breeds defined.