A ‘One Health’ approach to the control of pet parasites considers the broader implications of parasiticide use, balancing animal, human and environmental health. With funding support from a BSAVA PetSavers Clinical Research Project grant, Rosemary Perkins is investigating imidacloprid emissions from collar-treated dogs to assess the significance of this pollution pathway. In this article Dr Perkins explains more about the study and how this research fits into the broader picture of evidence-based and responsible pet parasiticide use.