The population of dogs in homes and their importance in peoples’ lives continues to grow globally. Often guardians wish to spend their free time with their dogs and are willing to pay more to do so. Therefore, dog guardianship considerably impacts many people’s ability to take part in leisure and travel, the activities in which they participate, the leisure destinations they visit, the accommodation they book, and the length of their holidays. This thesis aims to examine how and to what extent dog guardianship affects people’s leisure and travel preferences, intentions, and behaviours. Semi-structured interviews, a 7-day diary study, and three online surveys were used to investigate the research questions. The format of this thesis is PhD by Publication consisting of a series of four papers. The topics covered range from dog guardians’ subjective well-being and daily activities during the stress and crisis of the COVID-19 pandemic to visiting shared outdoor leisure spaces (SOLS) with dogs, the decision to travel with dogs, and specialist dog-friendly travel websites. Overall, this thesis provides four theoretical contributions including an investigation of the drivers/determinants of leisure-related behaviours of people with dogs; the production of four conceptual models capable of explaining and predicting guardians’ subjective well-being and behavioural tendencies; the use of dual-process theory frameworks, discovering the importance of intrinsic motivation and intention related to leisure and tourism with dogs; and highlighting the importance of human and dog well-being to guardians when forming behavioural tendencies and making decisions about leisure and travel with their dogs. Practical contributions related to communication and service innovation for a range of organisations are presented to improve human and dog well-being, cater for the needs and desires of the large segment of dog guardians, and provide opportunities for recovery and growth in the leisure and tourism sectors.