Physical Maturity:
* Small breeds: Often reach full size by 6-12 months old.
* Medium breeds: Can take up to 18 months to reach full size.
* Large breeds: May take 2-3 years to fully mature.
Behavioral Maturity:
* Puppiness: Typically lasts until around 18-24 months. This includes chewing, nipping, excessive energy, and difficulty with training.
* Adulthood: Marks a shift towards calmer, more settled behavior.
Other Factors:
* Spaying/neutering: Can affect maturity, typically slowing down development.
* Individual temperament: Some dogs are more "puppyish" than others, even when older.
General Guideline:
While there's no hard and fast rule, most dogs can be considered adults by the age of 2 years old. This is when they are typically fully grown, both physically and behaviorally.
Important Note: It's always best to talk to your veterinarian for personalized advice regarding your dog's development.