At 2 days old, that little tail wag during nursing isn’t a “social” wag yet. It’s more of a reflexive, spinal response tied to suckling, contentment, and nervous system firing. Think of it as the puppy version of a happy twitch. What it usually means: Strong suckle reflex ✅ Neurologic pathways waking up and firing normally ✅ Comfort + satisfaction while eating ✅ In the first week of life, puppies are basically running on primitive reflexes. The tail wag you’re seeing is driven by the spinal cord and brainstem, not higher brain processing. Nursing activates multiple reflex arcs at once ~ mouth, jaw, neck, core, tail ~ so the tail often joins the party. These are all signs of a healthy CNS coming online! When wagging becomes “real” 0–2 weeks: Reflexive tail movement (feeding, stimulation, elimination) 2–3 weeks: Random, inconsistent wagging as awareness increases 3–4 weeks: Social wagging begins (in response to littermates or humans) 4–5 weeks: Clear intent + personality starts to show...