There are primarily five stages to a dog, in my experience, until they are "grown up". They are the following:
Click each one to see what you're in for. EVERY dog will go through these stages.
Stage One
Stage Two
Stage Three
Stage Four
Back To Puppy Stages
Final Stage
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Setting Lessons
9 months-1year
Do not lay up for yourselves treasures on earth, where moth and rust destroy and where thieves break in and steal; but lay up for yourselves treasures in heaven, where neither moth nor rust destroys and where thieves do not break in and steal. For where your treasure is, there your heart will be also.

Matthew 6:19-21
Your dog may seem like the most obedient marshmallow on the block, but that doesn't mean the training stops, keep it up, teach them new tricks and have fun, but remember: You are the leader, you make the rules, you say what goes, that also means you are responsible for your dog and must keep them happy, by exercising them physically and mentally.