Dog ownership associated with longer life, especially among heart attack and stroke survivors: https://www.sciencedaily.com/releases/2019/10/191008083121.htm
Dog ownership was associated with a 33% lower risk of early death for heart attack survivors living alone and 27% reduced risk of early death for stroke survivors living alone. Dog ownership was associated with a 24% reduced risk of all-cause mortality and a 31% lower risk of death by heart attack or stroke compared to non-owners.