The Foetal Stage (Storm & Tulip) At 35 days of gestation, Tulip's puppies have reached an exciting milestone—the end of embryogenesis, the first phase of canine pregnancy. From this point forward, the developing puppies are no longer referred to as embryos but as foetuses. By Day 35, all of the major organ systems have formed and are continuing to mature. Tiny ears, eyelids, toes, and facial features are becoming more defined, and the puppies are beginning to take on a distinctly canine appearance. Although still very small, they are growing rapidly each day. The foetal stage is characterized by remarkable growth and development. In fact, beginning around Day 40, the puppies will experience their most dramatic period of growth, gaining approximately 75% of their birth weight during the final three weeks of pregnancy. As Tulip enters the second half of her pregnancy, her body is working hard to support the growing litter. Over the coming weeks, the puppies will continue to devel...