Dogs love to lie on their backs. They love to sniff things; dig; swim in water, be it salty or fresh; pull against their leashes; carry sticks; and, in almost any situation, bark loudly and insistently--more often than not at something unseen or unheard by lowly humans. Elliott Erwitt--as luck would have it--loves to take photographs of dogs. He loves taking photographs of dogs sniffing things, dogs digging, dogs swimming in ponds or in the ocean, dogs carrying sticks, dogs barking at something, and, more often than not, dogs lying on their backs in the grass, belly up and grinning from ear to ear.