Recently, shifting societal attitudes towards animals have resulted in an increasing challenge to the ‘social license’ to use animals in competitive sport. Against that background, this paper explores whether the use of animals in competitive sport is ever justifiable from the perspective of three commonly used ethical theories: deontology, utilitarianism and virtue ethics. In so doing, it recognises the importance of human understanding of animals as sentient beings. The author argues that when deontology, utilitarianism and virtue ethics are each used (...) to consider the question ‘Is the use of animals in sport ethically justifiable?’, only absolutist rights theory leads to a negative conclusion. Specified rights theory, utilitarianism and virtue ethics all allow for the human use of animals in sport. However, the author then goes onto argue that even if one does not accept an absolutist rights point of view and does believe that the use of animals in sport is generally ethically justifiable, that use should be limited by fulfilment of certain ‘qualifying constraints’: (a) minimisation of negative welfare effects and maximisation of positive welfare effects, to enable ‘good lives’ for animals (b) identification of and mitigation against avoidable, unnecessary risk and (c) compliance with governing body regulations and the law. (shrink)