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This article reviews evidence for the existence of attachment bonds directed toward humans in dog-human and horse-human dyads. It explores each species' alignment with the four features of a typical attachment bond: separation-related distress, safe haven, secure base and proximity seeking. While dog-human dyads show evidence of each of these, there is limited alignment for horse-human dyads. These differences are discussed in the light of the different selection paths of domestic dogs and horses as well as the different contexts in which the two species interact with humans. The role of emotional intelligence in humans as a potential mediator for human-animal relationships, attachment or otherwise, is also examined. Finally, future studies, which may clarify the interplay between attachment, human-animal relationships and emotional intelligence, are proposed. Such avenues of research may help us explore the concepts of trust and bonding that are often said to occur at the dog-human and horse-human interface.

Our investigation is the first to use attachment theory to explore four commonplace training methods (Conspecific, Behavioral, Eclectic, and Conventional) and owners' levels of attachment (anxiety and avoidance) to their horses. An international sample of horse riders and handlers (N = 538), aged 18-80 years, completed demographics and the Experiences in Close Relationships—Relationship Structures Questionnaire. Behavioral training participants scored significantly higher on the attachment-avoidance scores to their horses than the Eclectic or Conspecific training methods. The Behavioral and Eclectic training methods were associated with higher levels of education. Further research is warranted to elucidate the role that training methods play in the relationships between humans and horses.