The best mirror is a true friend." --<I>Dog Days</i><P>* If you are one America's 60 million dog owners you will rejoice in finding the perfect coffee-table book that is as expressive as your beloved canine companions.<P>Thirty-nine percent of dog owners confess that they have more photos of their beloved Fido than of their spouses or significant others. Looking through the pages and portraits of Gandee Vasan's <I>Dog Days</i>, this doesn't seem far-fetched.<P>* Vasan showcases more than 15 of the most popular dog breeds in <I>Dog Days</i> while perfectly capturing each canine's temperament, from a devoted black Lab and hopeful basset hound to companionable springers and curious Weimaraners.<P>* Gandee Vasan's work has been exhibited at the National Portrait Gallery in London and has garnered numerous awards. He finds his inspiration in absorbing what he sees around him and transforming it into what he wants others to see.