The 2020 guidelines feature the latest research, information and member input to provide veterinarians with science-based and sound guidance for relieving the suffering and pain of animals to be euthanized. This new version is the 9th edition since 1963 and updates the 2013 version.
Source: AVMA, January 15, 2020. Link. The guidelines are intended to support veterinarians, who must then use their professional judgment in applying them to the various settings where animals are to be euthanized.
The 2020 AVMA Guidelines for the Euthanasia of Animals are available at avma.org/euthanasia.