Labrador retriever puppies finish most of their growing by the time they are a year old, but may not completely stop growing until 18 months of age. These puppies usually reach their adult height by 9 months, with remaining growth focused on filling out their bone structure.
Labradors are considered a large dog breed, weighing as much as 80 pounds when fully grown. Females are usually smaller, weighing between 55 and 70 pounds. Labradors are known to have indiscriminate and voracious appetites, making them prone to obesity. A quality diet along with purposeful exercise helps puppies grow into adult dogs of a healthy weight.