We have a 9 month old nuetered male mastiff. He is very energetic. He acts more like a lab puppy than a mastiff. At what age to mastiff puppies mellow out or become lazy?

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the mastiff breed really doesn't mellow out until they reach full maturaty. which is at 24 months plus a little time depending on the dog. mine just hit 2 years and he is calming down fairly quickly.