Pet obesity is commonly encountered by veterinary professionals, yet little is known about their perception of communicating about pet weight. The objective of this study was to explore veterinary professionals' perception of discussing pet obesity with clients. An online survey targeting veterinary professionals was distributed via social media and veterinary organisation newsletters. Topics included respondents' perceptions of weight-related communication, factors related to approaching weight conversations and implicit weight bias. A total of 102 respondents to the survey were included in the final analysis. Avoidance of discussing pet obesity with certain clients was common (53.9%; 55/102). The most endorsed term for describing pets with excess weight to clients was 'overweight' (97.1%; 99/102). The pet's body condition score was rated the most important factor to consider when deciding how to approach a weight discussion with clients. Although only 29 participants completed the implicit association test (IAT), most of these participants were identified as having an unconscious preference for thin people. The small sample size limited the vignette analysis to descriptive only, and the IAT results should be interpreted cautiously. This exploratory, cross-sectional study provides early insight into veterinary professionals' perceptions of pet obesity-related communication and suggests the presence of weight bias in the profession that warrants further investigation.