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Usually they will grown to adult size by there first birthday! Usually for small dogs they say 7 or 8 months but i noticed that they actually don't finish until they are closer to one year old.

mine stopped growing at 8 months

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14y ago
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13y ago

Jack Russell live a long time. About 15-20. The oldest Jack Russell I've met is currently 22. The live this long time because they are small, easlily kept dogs.

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12y ago

At 10 months time.

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12y ago

13-14 years if cared for correctly (:

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Q: At what age do Jack Russells mature?
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