Dog's developmental stages by age
• Prenatal – In utero
• Neonatal (Newborn) – Birth to 12 days
• Transitional – 12 days to 3 weeks
• Socialization – 3 weeks to < 16 weeks
• Juvenile – 12 weeks to sexual maturity
• Adolescent – Sexual to social maturity (teenage stage)
• Adult – Social maturity to 7 years
• Senior – 7+ years
