Transitional – 12 days to 3 weeks
Puppies start to become more active, their eyes (10-14 days) and ears (14-18 days) open and they can start to walk as early as 12 days old. They start to urinate and defecate independently. This is a critical dog maturity period; what they learn from their mother and siblings will stay with them for life. This is the period to begin exposure to novel objects and other stimuli.
