This paper presents a case study of Fulani herdsmen in Nigeria, whose traditional ethnoveterinary practices risk being lost as the country transitions to more intensive and enclosed livestock practices. We use a planetary health framing to make visible the value of indigenous practices that are less damaging to the environment, animal welfare, and human health. Through ethnographic observation, focus group discussions (FGDs), and key stakeholder interviews, we show that the Fulani use a complex system of herbal medicines and traditional herding practices to maintain herd health, and to manage and treat animal disease when it arises. However, their traditions often sit uncomfortably with commercial farming practices. As traditional Fulani grazing lands are eroded, dispossessed Fulani take employment from businessmen farmers. Both parties’ inexperience with shed hygiene, artificial feed, and less environmentally resilient crossbreeds leads to an increased incidence of infectious disease. This, in turn, drives the higher use of antibiotics. There is, thus, a ‘causal chain’ of underlying drivers that lead, through poorer environmental, animal, and human health, to the increased use of antibiotics. The antibiotic resistance that emerges from this chain threatens human health now and in the future. Through a planetary health framing, we advocate for a deeper understanding of the knowledge held by Fulani herdsmen and their traditional ethnoveterinary practices as an alternative to increasing antibiotic use (ABU).