A recent international study has identified a notable association between cat ownership and national happiness levels, while also highlighting the potential negative impact of a common feline parasite on well-being. The research, which analyzed data from 93 countries, found that higher cat densities generally correspond with increased self-reported happiness across nations. However, regions with elevated exposure to the parasite Toxoplasma gondii—known to affect brain function and mood—showed significantly lower happiness scores.

The investigation incorporated happiness metrics drawn from the World Population Review, averaging data between 2022 and 2024, alongside statistics on cat populations per 10,000 residents and socioeconomic indicators such as GDP per capita and health expenditures. The United States leads globally with approximately 74.2 million pet cats, followed by China’s 53.1 million, underscoring the scale of feline ownership in wealthier societies.

Researchers initially aimed to assess whether economic factors like national income and health spending influenced happiness, while examining the specific role of T. gondii exposure in mood alterations. The study’s findings suggest that while greater cat ownership correlates with higher national happiness, this effect is partly intertwined with a country’s socioeconomic status. Wealthier countries tend to have more pampered, indoor cats, enabling pet owners to enjoy the psychological benefits of companionship without increased parasite exposure.

“Cats may contribute to happiness, but cat density may also partly be an indicator of broader social and economic conditions,” said study co-author Dr. Indrikis Krams. This view acknowledges that pet ownership reflects underlying societal health and prosperity, which also support general well-being.

The dual nature of the findings echoes previous psychological research showing that pets help alleviate loneliness and stabilize mood through emotional bonds. However, T. gondii’s capacity to alter human behavior poses a significant caveat. The parasite’s presence, as measured by IgM antibody prevalence indicating recent exposure, was strongly linked to decreased happiness scores among populations.

Overall, the study highlights the complex relationship between pet ownership, parasite exposure, and national well-being. While cats may offer emotional benefits, mitigating the risks posed by zoonotic infections like T. gondii remains important for maximizing their positive impact on human health and happiness.