Abstract

The new classical natural law theorists have been decidedly skeptical about claims that non-human animals deserve serious moral consideration. Their theory features an array of incommensurable, nonfungible basic aspects of welfare and a set of principles governing participation in and pursuit of these goods. Attacks on animals’ interests seem to be inconsistent with one or more of these principles. But leading natural law theorists maintain that animals do not participate in basic aspects of well being in ways that merit protection, that the so-called “argument from marginal cases” is unsuccessful as a basis for claims that animals have moral standing, and that affirming that animals have rights leaves one with no basis for maintaining that humans do as well. In response, I suggest that animals can be understood to participate in some aspects of well being, defend the argument from marginal cases, and offer reasons why we might believe that affirming that animals have rights does not undermine the claim that humans have rights