Anyone who has ever loved a dog, young or old, will warm to this stirring tribute to our best animal friends. Award-winning photographer Nancy LeVine has traveled the length and breadth of America -- from Kauai to Martha's Vineyard, from Seattle to Natchez -- to meet and photograph some of our most endearing senior canine citizens. Included here are 86 of her finest portraits.These gallant companions ride on our tractors, doze on our couches, happy...