Lifespan of companion dogs seen in three independent primary care veterinary clinics in the United States https://cgejournal.biomedcentral.co...2kwKGzHoUyl9R9bdzBpgTG29-KW-zbG1aZw0tr4mi4Wd4 Interesting research. Some of the findings (numbers in brackets are mean survival) - desexed dogs live longer than intact dogs, this is most noticeable in females. That's been shown in a number of research now - small but not signficant, difference between mixed breed (15.2) and purebred dogs from large gene pools (15.5). Although lower life expectancy in pure breds with higher levels of in-breeding. F1 Hybrids had highest longevity (16.1), but pool was smaller. Herding breeding mean was 15.2yrs. - Mean survival is 15.4years. Small dogs is 16.2 years and medium dogs 15.7 years - The Mountain ancestral breeds lived very short lives (not sure what these are, other than maybe a Bernese and St Bernard - maybe the big heavy dogs?) So the good news is, if a dog lives a full life then around 15yrs seems normal. I wish my Mr D had survived that long.