How often do animal shelters put animals down due to overcrowding?

Animal shelters rarely euthanize animals due to overcrowding alone. Most shelters have strict adoption policies and work hard to find new homes for their animals. However, in some cases, when shelters are too full and unable to care for all the animals, euthanasia may be considered as a last resort. The decision to euthanize an animal is not taken lightly and is usually made when there are no other viable options