One of the great scandals of Dogdom is that the bracycephalic dogs have been bred for deformities that can be life-limiting, such as breathing difficulties, spinal disease, eye deformities, and difficulty in giving birth. Same is true of several breeds, but the bracycephalics are an extreme example, made worse by their popularity and the Dark Side cashing in. (That's a whole 'nutha thread...)
The article also notes that young dogs are overrepresented in the Frenchie stats, skewing the average, largely due to the rise in popularity of the breed. In time you might see that statistic change.
IMO an important point in the article, quoting here, my underline:
https://www.bbc.com/news/science-environment-61262371
Many factors affect how long your dog will live, making average lifespans only partially useful.
Take for example the Chihuahua. Life expectancy from age zero is 7.9 years. You might think therefore that there isn't much point in rescuing a six-year-old Chihuahua at a dogs home because the average age at death for the breed suggests you'll only get to spend less than two years with it.
But veterinary records show quite a lot of Chihuahuas will die at a young age, pulling down that average life expectancy. And this means a Chihuahua that's reached six will likely live a lot longer than eight. We know some Chihuahuas will get to 15 or 16.
"It's that phrase 'damn lies and statistics'," said study co-author Dr Dan O'Neill.
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I do not see average lifespan as particularly relevant, and certainly not personally relevant, given that so many factors are at play. Nurture vs nature, and all that. It would be interesting to see the data broken down.
I'm glad sheltie averages didn't enter into my decision to adopt Haifisch at 12 years old... he lived to a few days short of 18. Six years of the best years of my life. I hope articles like this don't put people off adopting oldies - or providing appropriate care for their oldies.
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One line in the article is rather chilling:
With insurance for pets ever more common, actuaries will be keen readers of the new tables.