Putting an animal to sleep is a difficult and emotional decision that many pet owners may have to make during their lifetime. However, there are multiple synonyms for "putting an animal to sleep" that can make this decision a bit easier and less harsh. One such synonym is "euthanize," which means to end an animal's life humanely and without pain. Other synonyms include "putting down," "mercy killing," and "putting to rest." While it's never easy to say goodbye to a beloved pet, using these synonyms can help make the process a bit more comfortable while still providing the necessary end-of-life care for your furry friend.