Can a Pet Really Replace a Best Friend?

1. The Case For: Pets Do Measurably Help

A systematic review of 24 studies found that among adults, owning a pet was associated with lower levels of social isolation, and studies conducted after the COVID-19 outbreak specifically showed pet ownership was linked to lower loneliness.¹ This effect appears strongest for the people who need it most. A study focused specifically on socially isolated older adults found that those who had never owned a dog were more likely to report lower psychological health compared to socially isolated current or past dog owners, suggesting pets play a real role in providing emotional support and reducing the sense of isolation specifically for people who are otherwise cut off from regular social contact.²

The same research found that older pet owners living alone had psychological health comparable to older adults living with family members but without pets, a striking comparison suggesting a pet can close a meaningful part of the gap left by not having people in the home.² Separate research found that pet owners experienced lower loneliness than non-pet owners specifically when living alone, with loneliness itself mediating the relationship between pet ownership and overall wellbeing.³

2. The Physical Health Case Is Genuinely Strong

This isn't just a mental health story. A nationwide study of over 3.4 million Swedish adults found dog ownership was associated with a meaningfully lower risk of death and cardiovascular death, with the protective association actually strongest among people living alone.⁶ A separate study and meta-analysis found dog ownership was associated with a 33% lower risk of early death for heart attack survivors living alone, and a 27% reduced risk of early death for stroke survivors living alone, compared to non-owners, alongside a 24% reduced risk of all-cause mortality and 31% lower risk of death from heart attack or stroke overall.⁷

Researchers point to activated oxytocin release in the presence of pets as a plausible mechanism, suggesting this hormonal response helps protect against stress-related illness, on top of the more obvious benefits of increased physical activity and routine that come with pet care, especially dog ownership.

This isn't only a story about surviving a cardiovascular event better, there's evidence pets are linked to fewer events happening in the first place. The same nationwide Swedish cohort study found that in single-person households, dog ownership was associated with a lower risk of developing cardiovascular disease itself, not just dying from it, pointing to a preventive effect that sits alongside the survival benefit.⁶

3. The Honest Caveat: Pets Don't Fully Substitute for Human Connection

Here's the part that matters most for the specific situation you're asking about, and it would be a disservice to leave out. A longitudinal survey conducted during the COVID-19 pandemic found that pet ownership did not alleviate the specific type of loneliness that comes from a lack of friendships or workplace relationships (social loneliness), nor the loneliness that comes from deficiencies in family relationships (emotional loneliness).⁴ In other words, a pet appears to help with the general sense of isolation and provide real companionship, but it does not appear to be a full substitute for the particular kind of connection that comes from close friends or family specifically.

This is consistent with other findings in the field. One study identified what researchers call the "pet-effect paradox": pet ownership was associated with higher psychosocial stress and, in some analyses, poorer quality of life, even while qualitative reports showed pet owners genuinely perceived real emotional and social support from their animals. Mental health factors like existing depression and loneliness were stronger predictors of outcomes than pet ownership itself.⁵ Researchers reviewing this space emphasize the need to foster healthy pet attachment while also actively balancing pet companionship with human social interaction, rather than treating one as a replacement for the other.

The fair, complete picture: a pet is a real, evidence-backed source of companionship, emotional support, and even physical health benefit, particularly for people living alone. It is not, based on the current research, a full replacement for the specific relief that comes from close human friendship or family connection. Both things are true at once.

4. What This Means Practically

If you don't currently have close friends or family to rely on, the research supports a pet as a genuine, meaningful source of support, not a consolation prize. Pets can also function as a bridge back toward human connection rather than a replacement for it: they create natural opportunities to meet other people, through walks, dog parks, vet visits, or simply sharing pet stories with neighbors, which matters given everything the loneliness research elsewhere on this site shows about what actually rebuilds social connection.