Puppy's First Year: Complete Schedule for Vaccines, Training & Socialization
Month-by-month guide to a puppy's first year: vaccination and parasite prevention schedules, critical socialization windows, spay/neuter timing, and diet transitions.
Key Takeaways
Month-by-month guide to a puppy's first year: vaccination and parasite prevention schedules, critical socialization windows, spay/neuter timing, and diet transitions.
The first year with a new puppy is a crucial foundation-building period that significantly influences your dog's health, temperament, and behavior as an adult. Questions like "When should vaccinations start?" "What does socialization actually mean?" and "When do I switch their food?"—we've organized answers to common concerns new dog owners have, broken down by month of age.
Puppy Growth and Key Milestones by Age
Birth to 4 Weeks (Neonatal Period)
Weight: 200–500g at birth (small breeds) to 500g+ (large breeds) This is when maternal antibodies (passive immunity from colostrum) are critical. Puppies' eyes are closed and they spend almost all their time sleeping. Hand-rearing during this period requires bottle feeding every 2–3 hours and is extremely demanding.
3 to 12 Weeks (Socialization Period: Most Critical)
Weeks 3–12 (especially 4–8 weeks) is the golden window for socialization. Research shows that puppies exposed to various people, sounds, environments, and animals during this period tend to develop into confident, socially well-adjusted adults with less fearfulness.
What socialization should include: - Exposure to diverse people (men, women, children, elderly people, people wearing sunglasses, etc.) - Acclimatization to household sounds: vacuums, thunderstorms, fireworks, cars, motorcycles - Calm, supervised contact with other dogs, cats, and small animals - Familiarity with carriers, car rides, and veterinary clinic environments
When going outside before full vaccination, the widely recommended approach is carrying the puppy to experience the environment (without placing them on the ground to reduce infection risk).
8 to 12 Weeks (Appropriate Age for Handover)
Puppies are typically transferred to their new homes at 8 weeks of age or later. In most regions, selling or transferring puppies before 8 weeks is restricted by law or industry guidelines.
10 Weeks Onward (Begin Formal Training)
Start housebreaking and basic commands like "sit" and "wait." Since puppies have short attention spans, training sessions of 5–10 minutes, repeated several times daily, are most effective.