In ‘Do Animals Feel Pain?’ Peter Harrison argues that there are no good reasons to think that animals feel pain, that there are good reasons to think they do not feel pain, and that they should be treated well in order to promote not animal, but human, welfare. This is a provocative, and implausible, thesis. It has succeeded in provoking me, to rage and to rejoinder, but it has failed to convince me that a monkey shrieking as it is mutilated is not feeling pain and that feelings of concern for the monkey should play no part in my attempt to stop the mutilation.