A special introduction from the author: Lessons From Lucy is about my dog, Lucy, and the things she has taught me. Lucy and I are both getting on in years — I’m 71, and she’s 11 — but while I’ve tended to become crotchety, Lucy has somehow managed to remain playful and happy, even joyful. So I decided to try to figure out how she does it, and to see if I could improve my own happiness by doing the things Lucy does, except for drinking from the toilet.