I am hoping that with fanconi testing and following protocol on those already effected, things will improve. But I think the 14 to 16 is for those without serious health issues. If it included Fanconi and other such issues, rather skews it. When I look at life expectancy, I generally think of how long you can expect a HEALTHY dog to live.
For example, 13 to 15 not unheard of with rotties. Sadly, their very high cancer (particularly bone cancer) at a younger rate results in most dead before even 11. There is a pretty neat researcher going around the country interviewing owners and getting data on Rotties over 12. But most of us who have had many have gotten some that age.. my last 2 made it to 13 even though both had had cancer a couple of years before.. but not bone cancer. But the rest of mine died by age 10… cancer and one with bloat.
I look at Arwen with her autoimmune issues, on steroids.. albeit low dose.. for almost 5 yrs now. Will I be happily surprised if she makes it to 14? Very. Cara is a fanconi carrier only, healthy so far... I'd think she can make the higher numbers.