when are labs full grown
Labs don't take any longer to reach their full size than other breeds of the same weight/height. MENTALLY they take a long time to mature, not physically. Some people say Labs are not mentally grown-up until 4 or 5 years old! They act very playful and puppylike even when their bodies are full grown. I would expect her body to be finished growing by 18 months or so. FYI, the breeds that take the longest to physically mature (reach their adult height/weight) are the giant breeds, such as English Mastiffs, Great Danes, and Saint Bernards. Bruno CGC answered on 6/3/11.