Bobi, the world's oldest dog ever, dies aged 31 - BBC News
The Guinness World Record holder, from Portugal, lived to be 31 years and 165 days old.
I tried to use the Pedigree dog-to-human age calculator but it doesn't go up to 31 so your guess is as good as mine..
Bobi, the world's oldest dog ever, dies aged 31
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Most charts stop at 16, which shows how remarkable this is. As it's a curve not a straight line it's unclear if you can keep extrapolating but over 16 dogs seem to largely fall into the equivalent of people in their 80s.
This suggests 16 * ln(31) + 31 which gives 86 and doesn't seem old enough for the oldest dog ever.
https://www.google.com/amp/s/www.nbcnews.com/news/amp/ncna1233459