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Anyone who has watched a person light up describing their three dogs and two cats has probably wondered what is really going on beneath the obvious affection. Psychologists have spent the past two decades taking that question seriously, applying attachment theory, originally developed to explain the bond between infants and their caregivers, to the relationships people form with their pets. The findings suggest something more nuanced than a simple substitute for human company: pets appear to genuinely activate the same attachment system people use with other humans, and for some owners, particularly those juggling multiple animals, that caregiving instinct runs deep enough to shape their entire emotional wellbeing.

Why psychologists think pets tap into the same attachment system as people
Attachment theory was originally developed by psychologist John Bowlby to explain how the emotional bond formed between a parent and child in early life goes on to shape a person's relationships throughout adulthood. According toa study published in the journal, although this theory originally focused only on bonds between humans, there is compelling evidence that people also form genuine interspecies attachment relationships with their pets, with earlier research finding that people perceive their relationship with a pet as fulfilling the same core attachment needs as their relationships with other humans, including proximity seeking, ongoing maintenance of the bond, and genuine distress at separation. Other research cited in the same paper has found that losing a pet can feel every bit as painful as losing a human companion.

What determines whether a pet relationship is actually good for you
Simply owning a pet does not automatically translate into better wellbeing, according to more recent research digging into exactly what separates a genuinely supportive pet relationship from a stressful one. According toa study published in the journal by researchers Johanna Lass-Hennemann, Sarah Schäfer, Roxanne Sopp and Tanja Michael , the majority of prior studies had actually found a negative relationship between emotional attachment to pets and mental health, a counterintuitive finding the team set out to explain. Their research, surveying 610 German dog owners, found that a person's attachment style with other humans fully mediated the link between how strongly they were attached to their pet and their overall mental health burden, essentially showing that people with insecure human attachment styles tend to form particularly strong attachments to their pets, and that this pattern, rather than the pet relationship itself, was driving the poorer mental health outcomes observed.

Why the quality of the bond matters more than its intensity
A more recent study has pushed this picture even further, distinguishing between simply having a strong bond with a pet and having a genuinely secure one. According to research summarised by Trinity College psychology professor Brian Chin writing for The Conversation, people with secure pet relationships reported better wellbeing overall, while those with higher attachment anxiety toward their pets experienced greater distress, suggesting that the quality of the attachment matters considerably more than its raw intensity. The same research found that people who owned both a cat and a dog reported more depression symptoms than people who owned only one type of pet, though the study could not determine the exact cause, with one possibility being that managing multiple animals adds genuine caregiving stress and burden rather than simply doubling the emotional comfort on offer.

Why caregiving itself may be the real driving force
This is where the specific idea of a stronger caregiving instinct becomes genuinely relevant to understanding multi-pet households. According to a study published in, researchers exploring the role of attachment anxiety and avoidance in pet care found that individuals higher in attachment anxiety may feel more positive emotion specifically while engaging in caregiving tasks for their pet, and as a result tend to provide more pet care overall, while individuals higher in attachment avoidance tend to find less meaning in the same tasks and provide comparatively less care. This distinction suggests that for some owners, particularly those who find genuine emotional reward in the act of caregiving itself, taking on multiple pets may reflect less a desire to fill a social gap and more an active, ongoing need to nurture that keeping just one animal simply cannot fully satisfy.

Why attachment style, not pet ownership, seems to be the deciding factor
Taken together, this body of research points toward a conclusion that is more layered than the idea of pets simply replacing human relationships. According to the Attachment Project's summary of research in this area, studies have found that people with a strong attachment specifically to their dogs are more likely to report a greater fear of being unloved or rejected and to experience more difficult relationships with other people, a pattern that lines up closely with the BMC Psychiatry study's finding that insecure human attachment styles predict stronger pet attachment in the first place. Rather than pets causing poorer human relationships, the more consistent explanation across these studies is that people who already struggle with insecure attachment in their human relationships may be drawn toward forming particularly intense bonds with their pets, sometimes across multiple animals at once, as an outlet for a caregiving and connection need that feels safer to direct toward an animal than toward another person.

What this actually means for people with multiple pets
None of this research suggests that keeping several pets is inherently unhealthy or that it definitively signals someone is avoiding human relationships altogether. What the science does suggest is that the underlying drivers behind multi-pet ownership are genuinely psychological rather than incidental, tied to real attachment patterns, caregiving needs and emotional reward systems that operate very similarly to how people bond with each other. For anyone who has ever wondered why some people seem to keep taking in one more animal, the honest answer researchers are converging on is not simply loneliness or a substitute for company, but something closer to a genuine, deeply rooted instinct to nurture, one that some people appear to experience considerably more intensely than others.