Don't you feel great when that happens? My black Lab girl was one of the lucky ones who did not go grey. She also stayed slim and trim and energetic. Every year till she was 12 someone would ask her age and when I would say 9, 10. 11, 12 they thought I meant months. It didn't happen when she was 13 and 14. Possibly I delude myself by thinking when I said 13 that a 13 month old dog might not have looked that different from an adult of any age.