The field of urban studies has scrutinised digital technologies and their proliferation, but rather little attention has been paid to databases. Furthermore, contributions to date have focused almost exclusively on how digital technologies interface with human populations in cities. By contrast, we draw attention to databases maintained by city governments that contain identifying information about pet dogs and their legal owners in cities. Methodologically, our study merges database ethnography with multi-species ethnography. Conceptually, we contend that "dog data" contribute to orderly conduct in urban space. This orientation to urban governance illustrates "trans-biopolitics," in the sense of socially-situated and technologically-mediated power relations that operate through multi-species entanglements. As such, this article extends the literature on (neoliberal) urban policing by providing a fine-grained analysis of how emergent forms of social control become palpable. In general terms, the adoption and use of digital technologies by city governments has increased their capacity to enforce rules and regulations. Overall, we find that the more legible dogs and their legal owners become in databases, the more governable both dogs and people become in urban life.