Written as a deathbed letter to an unnamed friend and dated 1 October 1865, the pamphlet argues that intense physical pain is the most severe form of suffering. It suggests that legal and social protections for humans mean that comparable physical suffering is more often borne by animals than by people. The author frames cruelty to animals as raising a theological problem about animal suffering, and discusses suffering caused by predation, in which one animal lives by killing another. The author distinguishes between "cruelty proper", described as indifference to, or pleasure in, another creature's agony, and other motives that may lead to cruel conduct. The pamphlet argues that strong family and social attachments may coexist with a lack of concern for animal suffering. The pamphlet compares cruelty with offences against property, arguing that social and legal judgments often treat cruelty more lightly than theft. It includes examples involving livestock being driven to slaughter, including a case in which a drover was fined for setting a fire under an exhausted ox's head after it collapsed on the road. Later passages discuss
blood sports and hunting. The author rejects arguments that hunted animals suffer less than they would in nature, describes the fear and exhaustion involved in coursing and fox-hunting, and distinguishes between the excitement of pursuits such as fox-hunting and spectacles such as
cock fighting and
dog fighting. The pamphlet also gives practical recommendations. It urges readers who eat meat to ensure animals are killed by "humane slaughtermen" and to supervise the conditions of slaughter. It discusses responsibilities toward domestic animals, including the disposal of unwanted litters. It criticises some
experimentation on animals, while allowing that certain experiments might be justified if they were necessary for scientific progress. == Reception ==