A new study suggests that a horse's personality is shaped not just by genetics, breed, and age, but also by how they are housed, ridden, and cared for, as well as the relationship they have with their owners. Published in the journal Royal Society Open Science, the research emphasizes how daily management choices can influence a horse's behavior and well-being. This insight may help owners better understand and care for their horses, potentially improving their quality of life. The study, carried out by an international team of researchers, involved surveying 2,257 horse owners from Europe, North America, and other regions. These owners provided information on 2,767 horses, including their personalities and management practices. Owners used a 52-item questionnaire to rate their horses’ behaviors and also shared details about housing, riding frequency, time spent with the horses, use of headgear, ownership history, and the length of their relationship with the horse. The analysis identified four main personality traits in horses: human sociability (how they interact with people), attentiveness (how focused they are), neuroticism (how easily they become anxious or stressed), and horse sociability (how they interact with other horses). Intrinsic factors like age, sex, and breed had strong influences on these traits. For example, Warmblood horses tended to score higher in neuroticism, while draft horses scored lower. Geldings (castrated male horses) generally showed higher scores in both human sociability and attentiveness compared to mares. The study found that the length and stability of a horse’s relationship with its owner influenced its human sociability. Horses that had been with the same owner for over 10 years scored about 12% higher in human sociability than those with a new owner. Horses that had changed hands multiple times scored lower than those bought directly from a breeder. Owners who spent time with their horses without demanding specific tasks—like just being present or offering scratches—had horses that were more sociable with humans. Horses ridden four to seven times a week also showed better attentiveness and lower neuroticism, while those ridden less often were more prone to anxiety. Horses kept alone scored lower in horse sociability than those living with other horses, whether in pairs or larger groups. This suggests that social isolation might limit a horse’s ability to express natural social behaviors. The researchers note that the study does not prove cause and effect, and the effects found are relatively small. More long-term research is needed to understand whether management practices shape personality or if personality influences management choices. However, the study clearly shows that housing, interaction frequency, and the history of ownership are linked to noticeable differences in a horse's personality.