The reality that euthanasia in veterinary practice can end animal suffering but can also be used in circumstances that do not serve an animal’s interest, can be a benefit for animals, and a burden for veterinary professionals, respectively. This essay addresses ethical and practical concerns associated with companion animal euthanasia, including defining euthanasia, why and when euthanasia should be performed, applying euthanasia in practice, contemporary methods, aftercare of deceased animals, and the consequences of euthanasia and dysthanasia for animals, animal owners, and veterinary professionals. We contend that an intention-based definition of euthanasia should be strictly applied in veterinary practice and that practitioners view euthanasia decisions as requests that can (and in some cases should) be declined, rather than as mandates.