The NICU Stage of Puppy Development The first several days of a puppy’s life are often quiet, but they are anything but passive. This period is best described as the NICU stage of development, where growth, regulation, and survival take priority over stimulation. Newborn puppies are born neurologically immature. Their nervous systems are still learning how to regulate body temperature, digestion, heart rate, and stress responses. During these early days, the goal is not activ

The puppies have all settled in well during their first full day of life. Day one is a big transition for newborns as they move from the constant environment of the womb to regulating everything on their own. During these first 24 hours, nearly all of a puppy’s energy is directed toward staying warm, resting, and taking in nourishment. Newborn puppies are born without the ability to regulate their body temperature, so close contact with mom and littermates is essential. You w