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Dogs: Gestational Age ± 3 days
Cats: Gestational Age ± 2 days
<40 days
>40 days
(6 × GSDa) + 20
(15 × BPb) + 20
25 × BP + 3
(3 × CRLc) + 27
(7 × BDd) + 29
11 × BD + 21
(6 × HD) + (3 × BD) + 30
Days before parturition: 64–66 minus gestational age
Days before parturition: 61 minus gestational age
a Gestational sac diameter (cm)
b Biparietal diameter (cm)
c Crown rump length (cm)
d Body diameter at the liver (cm)
