What age is a mastiff full grown?

Best answers

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.

FAQ
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At What Age Is a Mastiff Full Grown? He doesn't reach his full size until approximately age 3.

When fully grown, the mastiff is one big dog.

The American Kennel Club standard for the male mastiff specifies an adult height of at least 30 inches tall at the shoulder, with females slightly smaller at 27.5 inches and up.

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After 12 months of age is when your Cane Corso will reach its final weight of 85-100 lbs and become a full-grown dog. This is when some males might start getting dominant over other male dogs, and also interested in females.
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18 to 24 months

English Mastiffs are huge with a lean, muscular build that takes longer to develop. This breed will reach full maturity at 18 to 24 months, but they'll continue to grow until four years old!
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At What Age Is a Mastiff Full Grown? He doesn't reach his full size until approximately age 3.

When fully grown, the mastiff is one big dog.

The American Kennel Club standard for the male mastiff specifies an adult height of at least 30 inches tall at the shoulder, with females slightly smaller at 27.5 inches and up.

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around three years

While most of the bones, muscles, and joint development happens during their first two years, Mastiffs reach their full size at around three years of age.
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18 to 24 months

Because the Pyrenean Mastiff is such a large breed, puppies may take 18 to 24 months to become fully grown.
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2.5-3 years

The Spanish Mastiff is a giant breed known well for its protective nature. They make excellent guard and watch dogs, providing Spanish livestock owners with security and safety. Most mastiffs won't fully mature until around the age of 2.5-3 years. Whereas smaller dog breeds will become fully matured by 18 months.
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