AIMS: This published study utilised a single case study examining the effect of providing a doll as a therapeutic tool for a person with dementia in a Residential Aged Care Facility. Specifically, the research examined doll therapy and associated it with observed past attachment needs. It was anticipated that by meeting past attachment needs, doll therapy may potentially reduce/prevent changed behaviour, by regaining personhood, providing opportunities for meaningful engagement, purpose, and control, thus enhancing the overall wellbeing of the participant. METHOD: A female participant, with moderately advanced Alzheimer’s disease, was the subject of this research. The case study used both qualitative and quantitative research design and methodology for data collection and analysis. For the purposes of this paper, the data was grouped under three logical categories: physical, emotional, and psycho/social behaviour. RESULTS: The results demonstrated that doll therapy was a positive intervention for the person with dementia in this research. The findings indicated a signficant reduction in changed behaviour related to the need for attachment and a considerable decline in anxiety and agitation. There was extensive ongoing improvement in social interaction, communication, mobility, and intake. Crucially, this study advanced understanding of (a) the use of a doll as a therapeutic tool to reduce changed behaviour in the participant living with dementia; (b) meeting the long-term attachment needs of the participant; and (c) the effect of therapeutic interventions on wellbeing. This research extends an understanding of how individualised complementary therapies may inform professional practice, promoting opportunities for the exchange of knowledge, stimulating research, and promoting best practice.