There is almost no theoretical discussion of non‐human animal well‐being in the philosophical literature on well‐being. To begin to rectify this, I develop a desire satisfaction theory of well‐being for animals. I contrast this theory with my desire theory of well‐being for humans, according to which a human benefits from satisfying desires for which she can offer reasons. I consider objections. The most important are (1) Eden Lin's claim that the correct theory of well‐being cannot vary across different welfare subjects (...) and (2) his objection against theories of human well‐being that require exercising a sophisticated capacity such as reason giving. (shrink)