Grey hairs on dogs doesn't necessarily signal the end! Our beloved Gracie, a Great Dane mix, was a shiny black dog with white toes and a white Taj Mahal on her chest. She started going grey at about 4 1/2, and we were sad because we knew Danes have a fairly short life-expectancy (7-10 years). Well, she live to 7, to ten, and beyond - all the way to 14 1/2, and all her grey did was make her look silly, like athe silly girl she was!