The growth of the field of medical research represents a significant development for the human species. New treatments are established to cure many diseases. Although the expansion of the field of medical research benefits human society in many areas, the ethical issue of using animals as experimental subjects is often overlooked. During this procedure, animals are used to experiment in place of humans to ensure the effectiveness of discoveries and treatments. These processes are not always successful and therefore often cause excessive pain and distress to the animals. Many animals suffer greatly and can even cause death. It is morally wrong to cause pain or distress to animals in the course of medical research because animals should have a right to well-being and thus live a pleasant life; we should not harm them during the research process. In this article I will defend this argument and provide a discussion of this issue by providing arguments to support my thesis and addressing a counter argument. In the course of medical research, animals are employed in painful ways and used in many experiments to test new discoveries or treatments. It is morally wrong to harm and cause pain or distress to animals in any way in the course of medical research because animals are part of moral society and therefore should be treated with fairness and respect. According to the theory of utilitarianism, the act is moral if it produces pleasure and absence of pain as results and produces the greatest goods for the greatest number of people where everyone counts equally in society. According to Jeremy Bentham's version of utilitarianism, everyone is counted and valued equally in society and this includes animals too. (Collier & Haliburton, 2011, p. 5-6) Although the use of animal testing in medical research produces goods for society in terms of