My best post from Petcha - Socialization tips for adult dogs, A tail of Two Collies

With an adult dog, things around the house are usually quite a bit calmer than with puppies or young dogs. Watch for changes in behavior from younger days. Dogs who went to day care or were the life of the party at the dog park may show signs of no longer enjoying these activities. I often tell my clients the following analogy: “When I was younger, I used to slam dance in a mosh pit, but I rarely enjoy large crowds these days.”

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A Tail of Two Collies - Socializing the Adult Dog