At what age is a dog no longer a pup?
Although all puppies are officially considered adult dogs once they reach one year old, puppies continue to grow in height and size while their bones are still developing, which takes anywhere from 6 to 24 months.
For dogs, hitting the age of 2 years is very similar. A 2-year-old dog is no longer a puppy — not even an older one. Once a dog hits 2, he's truly a young adult.
The short answer is yes, your pup is still growing at 9 months old. Many small and tiny breeds are at about 90% of their adult size at the 9 month mark, while large and giant breeds are only at roughly 70% of their adult size.
Most dogs reach puberty and become fertile when they are six months old, although they shouldn't have puppies until they are fully grown. Small breeds reach adulthood when they are one year old and can safely have puppies if they are done growing.
The most challenging time of raising a puppy is the adolescent period. Dogs become “teenagers” and seem to forget everything they have ever been taught. This period is individual to each dog, but it may begin when he's about eight months old and continue until he's two years old.