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Medium-large dog breeds (Collies, Labrador Retrievers, Boxers) are at full growth by about 18 months and at their full weight by about 2 years of age.

Giant dog breeds (Great Danes, Mastiffs) may take up to three years to reach their full weight, though they should be fully grown into their paws by about 18 months.

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French Mastiffs typically reach between 23-273 in height and weigh between 120-140 pounds (54-63 kg), on average. They generally reach their final size by 19 months of age and there is little variation in size between the males and females of the breed.

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