While searching for a companion for George Bailey, Gregg was shocked to see a banner on an Ohio animal shelter's Web site that detailed how tough it is for big dogs with black coats to find homes. "It said something like, 'We know that you people prefer colors, but we've got wonderful black dogs here, won't you please consider them?'" recalls Gregg, who's 49 and lives in Xenia, Ohio. "I was shocked, because I think that black dogs are beautiful — and I couldn't believe people would not get a dog based on its color." To the uninitiated, the idea...