When Do Dogs Reach Full Size?

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. Their skeletal growth is what determines how tall they will become as adults.

Can you tell how big a puppy will get?

To predict your puppy's adult height, measure his height at 6 months of age. Then multiply this figure by 100 and divide that answer by 75. In other words, puppies achieve about 75% of their adult height at 6 months old.

Are dogs full grown at 6 months?

By six months of age, your puppy's growth will slow down. Most small dog breeds will be nearly finished growing at this time, though they may continue to fill out over the next three to six months. ... Large and giant dog breeds tend to keep growing until they are 12 to 24 months old.