Ideally, the best time to scan a dog is 21-days (3 weeks) after the first mating. This is enough time for the puppies to develop in the womb of the bitch and appear on the screen of the ultrasound scanner. Around this time, the placenta is formed and the puppies are around 5mm – 8mm in length.
Fortunately, dog pregnancies do not last as long as humans. Dog pregnancies last around 9 weeks in total, compared to 9 months for a human. This is why you can perform a scan very early.
At the same time, some clinicians are not properly trained to detect puppies at 21 days. Therefore, they may request to see you and your dog for an ultrasound scan at 28 days.
Our team may also request to scan your dog at 28 days, free of charge. This may happen if we cannot detect puppy at 21 days, or they do not seem to be correctly developed. If a client cannot remember the specific date of their dog’s mating, then we request to scan at 28 days.