Tulip and Storm Litter By Day 45 of a dog's gestation, the puppies are structurally complete, with their major organs, skeletons, and reproductive organs fully formed. At this exciting stage, the fetuses are actively mineralizing their bones and beginning to grow their first coats of fur. The puppies' skeletons are hardening and becoming more defined, meaning their skulls, spines, and pelvises are now clearly visible. Fine fur is beginning to cover their bodies, and they are rapidly gaining both size and weight. While most major organs are fully developed, essential systems such as the lungs continue maturing in preparation for life outside the womb. The fetuses are now starting to look much more like puppies. Tiny toes, nails, and whiskers have formed, and their skin pigmentation is developing. Eyelids formed around Day 32, toes became visible by Day 35, and nails appeared around Day 40. Over the past few days, the coat and skeleton have continued to develop and strengthen. At...