NAVLE（北美执业兽医考题）Day 630

An owner brings her 4-year old female Labrador Retriever to your clinic because she believes she might be pregnant. She does not remember when the dog's last heat cycle was. The dog's abdomen appears fairly distended and you take a lateral abdominal radiograph which is shown below. What would be the earliest time you would expect to be able to see fetal skeletons on abdominal radiographs in the dog?

一个畜主带了一只4岁的雌性拉布拉多犬来看诊，她认为这只狗可能怀孕了。 她不记得狗的最后一次发情是什么时候。 狗的腹部看起来很胀，你拍了一张腹部侧位的X光片，如下图所示。 最早多久能在狗腹部X光上看到胎儿的骨架？