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When he Gets Grey Hair all Over His Face and Looks Old. Your Mastiff Will NEVER Know He Is Not a Pup! But Propably Around The Age Of 2 To 3 Is When you can consider your Pup An Adult.

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16y ago
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15y ago

Dogs physically mature over 15 months of age

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14y ago

The lifespan of a Mastiff is 8 - 10 years.

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13y ago

On her 2nd or 3rd heat.

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Q: What age do you breed your female mastiff?
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