Zada was 7 years Dec. 5th, Azrael was 7 years Jan. 16th, Razael was 5 years, Sept. 4th and none of them have ever been sick. I have a 12 year old Papillon that's never been sick and now have a Yorkie puppy who was born Sept 5th, and she's never been sick.
I've never fed dog food, I home cook and I really do think that makes a major difference.