A dog is generally considered an adult between the ages of 1 and 2 years. This varies based on breed size, with smaller breeds becoming adult around 8 to 12 months, medium breeds around 12 months, large breeds between 18 to 24 months, and giant breeds sometimes taking up to 2 years to fully mature. Key markers of adulthood in dogs include sexual maturity (typically around 6 to 8 months), physical maturity (reaching full height and size, generally by 12 to 24 months depending on breed), and emotional/social maturity, which can take up to 24 months. At adulthood, dogs tend to have stable energy levels, consistent behavior, and full physical development, including their adult coat and teeth.
