Like most mammals, your Lab puppy was born toothless. The rate at which pups grow their first teeth may vary slightly, but by the time you got your new Lab puppy, he was probably at least 6 weeks old and had his full set of milk teeth (properly called deciduous teeth).
http://pets.thenest.com/lab-puppy-teeth-growth-3864.html
Re: When are labs fully grown? 61lbs is within normal range for a properly bred lab. Finley is around 60 and he's 16 months. At 7 months your Mar still has some growing left to do, rule of thumb is 18 months or so you can consider them fully grown, but it does depend on the dog. Some will take longer, some a bit less.
http://www.justlabradors.com/forum/lab-chat/47398-when-labs-fully-grown.html
Male dogs will usually be heavier. In 15 months, the Labrador retriever puppy (born around one lb) multiplies his birth weight by 70 or more! Most Lab puppies are around 10 lbs at eight weeks of age and reach 50 lbs at around seven months of age. As a rule of thumb, they will gain 2 lbs a week until they are about 26 weeks old. Because they grow so quickly, your pup may appear clumsy and awkward for a while as he adapts to his bigger, stronger body.
http://www.clublabrador.com/labrador-pup-dog/how-to-measure-a-labrador-puppy-growth-chart/
Your Puppy's Grown-up Teeth. Around 4 months of age, your Lab puppy will begin replacing the milk teeth with adult teeth. At 6 to 7 months, the full set of 42 permanent teeth will be in. As your puppy grows, the roots of his baby teeth are reabsorbed by his body.
http://pets.thenest.com/lab-puppy-teeth-growth-3864.html
Reaching adulthood. Depending on the breed, a puppy reaches his adolescence between 6 months and 18 months of age, and during this period of approximately 6 months, your ball of fur is almost at his full size. Your pooch will become sexually mature and capable of reproducing during his period of adolescence.
http://www.dognotebook.com/how-long-does-it-take-for-a-pup-to-reach-its-full-size/
Re: When are labs fully grown? I have been told (by breeder and vet) that they should reach their full height by about 1 year and then continue to fill out til they are about 2. That being said, each dog is different (just like people) and their growth rates will be different.
http://www.justlabradors.com/forum/lab-chat/47398-when-labs-fully-grown.html
Medium breeds weighing up to 80 pounds as adults, will typically reach their full size between 12 and 16 months of age, while large and giant breeds weighing over 80 pounds, may reach their adult size between 18 months and 2 years old.
http://www.dognotebook.com/how-long-does-it-take-for-a-pup-to-reach-its-full-size/
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.
http://www.dogster.com/answers/question/do_labradors_take_the_longest_to_fully_grow-48779
I'm a Big Kid Now. The American Kennel Club’s standard for a fully grown adult male Lab calls for a height of 22 1/2 to 24 1/2 inches tall at the withers. He should weigh between 65 and 80 pounds. The female should grow to between 21 1/2 and 23 1/2 inches tall and weigh from 55 to 70 pounds. Head Games.
http://dogcare.dailypuppy.com/age-labrador-retriever-fully-grown-7864.html
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.
http://www.dogster.com/answers/question/do_labradors_take_the_longest_to_fully_grow-48779
how long do labs grow
Labs take 1 year to grow. Labs grow in 1 year.