Human-Animal Attachment Research: What Gullone and Clarke Actually Looked At

The 2015 work by Emanuela Gullone and colleagues sits in the broader literature on human-animal bond measurement and the psychological dimensions of keeping companion animals. If you are looking for a single downloadable tool or dataset labeled "Gullone And Clarke 2015 Pets," that does not really exist as a standalone product. What exists is a cluster of peer-reviewed findings, most notably the development and validation work around instruments like the Companion Animal Bond Questionnaire and related scales that Gullone helped refine over several years leading up to and including that period. The research from this timeframe generally examines how people form attachments to their pets, what predicts differences in attachment quality, and how those attachment patterns relate to wellbeing outcomes. The core instruments typically measure dimensions like emotional reliance, perceived mutual attachment, and anthropomorphic tendencies. These are not casual survey items — they come from factor-analytic validation studies with decent sample sizes and cross-cultural comparisons. I spent time working through the actual scale items and response formats a few years back when a client wanted to assess attachment quality in their participant pool. One thing that caught me off guard was how sensitive the scores are to how the question is framed. A question about "my pet would be difficult to replace" versus "I would miss my pet" pulls from different statistical factors even though they seem interchangeable to a lay reader. I had to go back and restructure my data coding because I had lumped them together at first. It cost me about two days of recoding before I realized the scale subdimensions were not collapsing the way I assumed they would.

Another practical detail most beginners miss: these scales tend to produce ceiling effects with dog owners in particular. The average scores cluster near the top of the range, which makes it harder to detect meaningful differences between groups unless your sample is large enough or your groups are genuinely distinct. If you are running this on a small volunteer pool of self-identified dog lovers, your variance will be thin and your statistical power will drop quickly. I found that switching to a mixed-pet population or adding a comparison group without pets gave me workable effect sizes where none existed before.

How the Research Actually Works in Practice

The standard approach involves administering validated questionnaire items to participants who report keeping at least one companion animal. Responses are typically on a Likert-type scale, and scores are aggregated into subscale totals based on the instrument's published structure. Some versions also include a demographic section covering species, age of the animal, duration of cohabitation, and whether the animal was acquired through adoption or purchase. What you get out of it is a picture of attachment quality, not a clinical diagnosis. The scales can differentiate between levels of bonding, and they correlate reasonably well with measures of loneliness, depression, and life satisfaction. But correlation is not causation, and the directionality problem is real. People who are more lonely may seek out stronger attachments to pets, or people who already have strong social bonds may still value their pets highly for completely different reasons. The research acknowledges this, but it is easy to misread a positive correlation as a treatment effect if you are not careful. A counter-intuitive finding from this body of work is that higher attachment scores do not always translate into better human outcomes. In some samples, people with the highest attachment scores also showed elevated anxiety when their pets were absent or when they perceived their pet's health as at risk. So the relationship between bond strength and wellbeing is not a simple linear one. It is more accurate to describe it as curvilinear or moderated by other variables like prior attachment style or existing social support networks.

Get the Full Details

(PDF) Gullone, E., & Clarke, J. (2008). Human-Animal Interactions: The Australian Perspective ...
(PDF) Gullone, E., & Clarke, J. (2008). Human-Animal Interactions: The Australian Perspective ...

What to Watch Out For

The biggest bottleneck with this research is sample bias. Most of the published work draws on convenience samples — university students, online panel respondents, or members of pet-focused organizations. That skews the results toward younger, more educated, and more pet-engaged populations. If you are trying to generalize these findings to older adults, rural communities, or lower-income households, you are working outside the validation boundaries of the original studies. Another limitation is the cultural specificity of many of these instruments. The Companion Animal Bond Questionnaire and its variants were developed primarily in Western, English-speaking contexts. Translation studies show that factor structures can shift noticeably when the items are rendered into other languages, and not always in predictable ways. I ran into this when a colleague in Portugal tried to validate a local version and found that one of the subscales split into two separate factors after translation. You cannot simply assume the original scoring keys will carry over. If you need something more behaviorally grounded than self-report questionnaires, the literature points toward observational protocols or physiological measures as complements rather than replacements. Some researchers have paired attachment scales with cortisol sampling or heart rate variability during pet-interaction tasks. Those approaches are more labor-intensive and require stricter ethical approvals, but they sidestep the self-report bias problem entirely.

Where to Find the Actual Materials

The original scale instruments and validation papers are accessible through academic databases like PsycINFO, Web of Science, or Google Scholar. Search for Gullone's publications from the early-to-mid 2010s period alongside keywords like companion animal bond, human-animal interaction, and attachment measurement. Some versions of the scales are available for research use through the authors or their affiliated institutions, often requiring a brief inquiry explaining your intended application. Commercial licensing is not typically required for academic research, but you should still check the specific terms attached to each instrument version, as they have evolved over time. There is no central download page labeled with the name you searched for. The materials are scattered across journal articles and supplementary files. The most efficient route is to track down the primary validation study for whichever instrument version you plan to use, then follow the author contact information listed there for permission or additional scale materials.