We can learn from the dogs (and rats).

Know your Master's voice, so that you are not mastered.

The little terrier was a terror.

Though he loved his master, Mark Barraud, he too often occupied himself by nipping and biting at the ankles of anyone who came close enough. He was the kind of pet only the master would love. His name was Nipper, and it was fitting.

When Nipper’s master died, he was sent to live with Francis Barraud, the brother of Nipper’…