United States Schools of Veterinary Medicine offer classes on death, dying, euthanasia, & all of the above on the human client. Research, limited though it is, seems to indicate that those who take the course find the information very useful & therefore helpful. Some universities are requiring veterinary students to take the course while others have it listed as an elective.
Various organizations in the United States provide CEUs for health care providers on death, dying, and the dynamics involved in both as well as treatment for the dying patient and their families.
Unfortunately, I don't know when it happens, only that it does, as a result of my research into griefwork upon the death of a companion animal. If the online catalog allows a search, you might try looking under death, dying, euthanasia & griefwork.