This discussion focuses on veterinary practice as a form of service delivery. Based on data collected during a year of participant observation in a major veterinary hospital in the northeast, the paper examines the criteria veterinarians routinely used to define nonhuman patients as problematic and the means they employed to deal with troublesome animals. The conclusion frames veterinarians' tactics for evaluating and controlling patients within the larger context of how rule-breakers are identified in everyday interactional settings and the routine approaches (...) used in the exercise of social control. (shrink)