Written By: Mobin
Great Danes grow incredibly fast, gaining up to 100 pounds in their first year. But they keep growing until age 3, sometimes topping 200 pounds.
Though English Mastiffs grow quickly as puppies, they continue putting on pounds after their first birthday.
The beloved St. Bernard breed grows rapidly in their first 2 years, but they keep adding bulk until age 3 or 4. Healthy adult males can weigh 180-200 pounds
Great Pyrenees puppies have huge paws hinting at their future giant size. They reach maturity around age 2 but may fill out up to age 4
Newfoundland dogs grow quickly in their first year but keep gaining height and weight until age 3. Healthy adult Newfs weigh 130-150 pounds.
Irish Wolfhounds continue growing later than most breeds, not reaching full maturity until age 4. Adult males stand over 30 inches tall and weigh 120-180 pounds.
Leonberger puppies have adorable oversized paws indicating how massive they'll become. They reach adult size by age 2 but fill out until age 4