Dog Puppy First-year Milestones

Puppies grow at an astonishing rate, and their first year is packed with crucial developmental milestones. Understanding what to expect—and when—helps you spot potential health issues early and ensure your puppy develops confidence, social skills, and good behaviour habits.

From their eyes opening at around two weeks, to losing baby teeth by five months, to reaching full physical maturity between 12–18 months depending on breed, each stage brings new needs. Vaccination schedules, socialisation windows, house training, and play behaviour all follow predictable patterns. Missing key socialisation periods (typically 3–12 weeks) can affect your puppy's long-term temperament, which is why early exposure to different people, environments, and experiences matters far more than many owners realise.

Tracking these milestones isn't just interesting—it's essential veterinary information. Growth records, vaccination dates, behavioural changes, and training progress all paint a complete picture of your puppy's development and help your vet identify any concerns before they become serious.