Being mixed breed versus purebred, spay/neuter status, and regular dental cleanings at the vet, are also linked to lifespan. Body size is the most important variable in predicting life span, but mixed breed dogs live longer than purebreds. Photo: Lunja/Shutterstock A study of over 2 million dogs attending veterinary clinics in the US answers some recurring questions about lifespan and dogs. The research, by Dr. Silvan Urfer (University of Washington) et al., analysed data from over 169,000 dogs in this cohort that died or were euthanized within a three-year period. In all size groups (small, medium, large, and giant), mixed breed dogs live longer than purebred dogs, although the difference is not that large. The study found that, on average, a mixed-breed dog lives for 14.45 years compared to 14.14 years for a purebred dog. For purebred dogs there was some variability in lifespan according to the breed. For example, amongst the breeds the scientists classified as giant, Great Pyrenees...
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