[OA] Dog Ownership and Survival
WHAT IS KNOWN
· Dog ownership has been associated with decreased cardiovascular risk. A series of studies has suggested associations of dog ownership with lower blood pressure levels, improved lipid profile, and diminished sympathetic responses to stress.
· The evidence regarding dog ownership and mortality has yielded conflicting results. Whereas the association between dog ownership and mortality has been explored since the 1980s, living in a home with a dog has been associated with improved survival in some studies with others arguing a neutral effect.
WHAT THE STUDY ADDS
· Pooling the data of 3 837 005 participants, dog ownership was associated with a 24% risk reduction for all-cause mortality as compared to nonownership (relative risk, 0.76; 95% CI, 0.67–0.86).
· In analyses of studies evaluating cardiovascular mortality, dog ownership conferred a 31% risk reduction for cardiovascular death (relative risk, 0.69; 95% CI, 0.67–0.71; I2, 5.1%).
· Dog ownership is associated with lower risk of death over the long term, which is possibly driven by a reduction in cardiovascular mortality. These results hold implications for future studies on lifestyle interventions.
Background: Dog ownership has been associated with decreased cardiovascular risk. Recent reports have suggested an association of dog companionship with lower blood pressure levels, improved lipid profile, and diminished sympathetic responses to stress.
However, it is unclear if dog ownership is associated with improved survival as previous studies have yielded inconsistent results.
Thus, we performed a systematic review and meta-analysis to evaluate the association of dog ownership with all-cause mortality, with and without prior cardiovascular disease, and cardiovascular mortality.
Methods and Results: Studies published between 1950 and May 24, 2019 were identified by searching Embase and PubMed. Observational studies that evaluated baseline dog ownership and subsequent all-cause mortality or cardiovascular mortality. Two independent reviewers extracted the data. We assessed pooled data using random-effects model. A possible limitation was that the analyses were not adjusted for confounders.
Ten studies were included yielding data from 3 837 005 participants (530 515 events; mean follow-up 10.1 years). Dog ownership was associated with a 24% risk reduction for all-cause mortality as compared to nonownership (relative risk, 0.76; 95% CI, 0.67–0.86) with 6 studies demonstrating significant reduction in the risk of death.
Notably, in individuals with prior coronary events, living in a home with a dog was associated with an even more pronounced risk reduction for all-cause mortality (relative risk, 0.35; 95% CI, 0.17–0.69; I2, 0%). Moreover, when we restricted the analyses to studies evaluating cardiovascular mortality, dog ownership conferred a 31% risk reduction for cardiovascular death (relative risk, 0.69; 95% CI, 0.67–0.71; I2, 5.1%).
Conclusions: Dog ownership is associated with lower risk of death over the long term, which is possibly driven by a reduction in cardiovascular mortality.
Kramer Caroline K, Mehmood S, Suen Renée S. Dog Ownership and Survival. Circulation: Cardiovascular Quality and Outcomes 2019;12:e005554. https://doi.org/10.1161/CIRCOUTCOMES.119.005554