It has to stop. Most pets don’t know they’re going to die, those that are ‘trying’ are generakky too sick to know where they are or what’s going on, and if animals are routinely ‘terrified’ then the vet clinic staff is probably doing something wrong.
People just seem to get off on spreading words that cause shock and a sad twinge, not realising what that might do to someone who’s grief is still raw. And I challenge you to show me any pet owner who’s wounds cannot be reopened by the wrong words.