Bovine tuberculosis is a controversial animal health policy issue in England, which impacts farmers, the public, cattle and badgers. Badgers act as a wildlife reservoir of disease. Policy options for badger control include do nothing, badger culling, and badger vaccination. This paper argues for mandatory Animal Welfare Impact Assessment for all policy that significantly affects sentient animals. AWIA includes species description, and AWIA analysis stages. In this paper, AWIA is applied to impacts of bovine TB policy options on cattle and (...) badgers. Over 4 years, 85,000 badgers will be culled to prevent the slaughter of ~17,750 cattle over 9 years. Hence, about five badgers are culled for every cow which avoids slaughter. The AWIA analyses the impact of badger vaccination on cows and badgers based on a set of stated assumptions. The AWIA estimates badger vaccination to reduce the number of cows slaughtered by 11,600, i.e. a 12.5% reduction. Additional to the harm of killing, culling has greater welfare impacts on badgers compared to non-culling options. Actors in animal health and welfare policy were interviewed about the concept of AWIA. Policy actors supported the idea of AWIA to provide objective data to feed into policy making. The paper concludes with the proposal that AWIA is a necessary stage of just policy making where sentient animals are impacted by government policy. (shrink)