Ethical and scientific considerations when making decisions to euthanise companion animals

Euthanasia is a highly controversial issue in human society. In the field of veterinary medicine, there are guidelines that are intended to assist with the decision-making around euthanasia and reduce the possible ethical and moral conflicts involved with these situations. In this review, we have collected the existing information that allows veterinarians to better understand the factors surrounding the practice of euthanasia. Specific literature on topics such as the pathophysiology of pain in animals, clinical situations that could lead to a decision to euthanise an animal, possible ethical and moral conflicts, the management of emotions by animal tutors, etc. This article provides a general and practical overview of this potentially complex issue for the benefit of students, veterinarians, and the general public from both an ethical and medical point of view, and covers the fundamental concepts and notions that can facilitate decision-making concerning the euthanasia of animals. Ethical practices in veterinary medicine and the correct application of animal welfare principals are central to making such decisions responsibly.