Background Cats are the most popular pets in the UK, yet relatively little research has been conducted into the welfare of cats living in a home environment. The purpose of this study was to determine and prioritise welfare issues for cats using a Delphi method. Methods Cat welfare experts (n=14) were asked to identify and rank welfare issues for cats in the UK. An initial listof 118 welfare issues was generated by an anonymous online discussion board of experts and thematic analysis using NVivo. Subsequently experts ranked the list of welfare issues according to severity, duration and prevalence usinga 6-point Likert scale. All issues with a median score of 3 or above (n=43) were included in the second survey to determine agreement on the ...