Sharing welfare research data openly accelerates scientific progress and enables independent verification; open data practices in animal welfare science are improving but inconsistent.
Open data practices in animal welfare science have real welfare implications: data that is shared enables the meta-analyses and systematic reviews that provide the most reliable evidence base for welfare standards and interventions. Data that is withheld because it is commercially sensitive, because it shows negative results, or because researchers prioritise competitive advantage over scientific progress limits welfare knowledge and the standards that depend on it. The welfare movement as a whole benefits when welfare research operates on open science principles that maximise the value of every study conducted. Advocacy for open data in welfare research is therefore a welfare improvement effort as well as a scientific governance one.