Sounds like he's starting to grow up and assert himself.... Welcome to the "Kevin" period! He will be a little git for a while, pushing his boundaries and seeing what he can get away with, basically. That nice little happy, eager to please, puppy has gone into remission for a while. Now comes the time to be firm and assertive yourself. He will be a truculent teenager for a while but it should all pan out in the end as long as you are gentle but firm, continue with the training classes as they do help remind him you're in charge.... and stay focussed....

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