Eat. Play. Love. The three most important dog words in the English language. And maybe these: Car. Cookie. Potty. Walk. If you don’t believe me, trying walking into our house and saying one of them, and see if you aren’t immediately put upon to perform a trick. Every dog has its day, and today is Madison’s: She is 15 years old. The little stinkpot has outlived both of her canine siblings, Uncle Chico and her mother, Annie. Fifteen. Wow. For a 10-pound dog like Maddie, that’s about 76 in human years, according to Mr. Googly. (Please disregard the “one dog year equals seven human years” malarkey. It’s a myth, along…