Flexible use of a multi-purpose tool by a cow.

Imagine the tools a cow would make. This idea, humorously illustrated in Gary Larson's Far Side cartoon, captures a widespread assumption: cows are neither problem-solvers nor tool users. In science, as in culture, livestock species are often cognitively underestimated, reinforced by their utilitarian role and persistent mind-denial biases associated with meat consumption1. Despite over 10,000 years of domestication, research on cattle cognition remains scarce and confined to applied contexts such as productivity and welfare2. Tool use, while rarely observed, offers a stringent test of cognitive flexibility. Defined as the manipulation of an external object to achieve a goal via a mechanical interface3, tooling ranges from species-typical routines to innovative, problem-specific acts4,5. We report here our experimental demonstration of flexible egocentric tooling in a pet cow (Bos taurus), Veronika, who uses a deck brush to self-scratch. Across randomized trials, she preferred the bristled end but switched to the stick end when targeting softer lower-body areas. This adaptive deployment of tool features reveals multi-purpose tool use not previously reported in non-primate mammals. Our findings broaden the taxonomic scope of flexible tool use and invite a reassessment of livestock cognition. VIDEO ABSTRACT.