CANINE PREGNANCY

EVENTS

Approximate time of canine pregnancy events in relation to the time
of ovulation and potential fertile matings
Pregnancy-related
event
Number of days
after ovulation
Number of days
after fertile mating
Onset of oestrus -6 to +3  
First of multiple matings -7 to +5 -12 to 0
Fertile mating -5 to +5 0
Ovulation 0 -5 to +5
Fertilization 2 to 5 0 to 7
Vaginal cornification reduced 5 to 7 0 to 12
Embryo attachment to uterus 14 to 16 9 to 21
Vesicles visible with ultrasound 15 to 17 10 to 22
Palpable 1 cm swellings 20 to 22 15 to 27
Foetal heartbeat visible (ultrasound) 22 to 23 17 to 28
Uterine swelling visible on X-ray 28 to 30 23 to 35
Palpability of swellings reduced 30 to 32 25 to 37
Earliest X-ray pregnancy diagnosis 43 to 45 39 to 50
Foetal pelvis visible on X-ray 51 to 55 46 to 60
Foetal teeth visible on X-ray 56 to 61 51 to 66
Whelping 62 to 64 57 to 69

 

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