Sighing is a natural physiological response that involves the deep inhalation and subsequent exhalation of breath. It often occurs when a person feels emotions such as relief, frustration, or sadness. Sighing can help regulate breathing and may serve as a way to release tension or stress. In addition to its emotional significance, sighing can also have physical benefits. It helps to increase oxygen intake and can promote relaxation. While often associated with human behavior, sighing is also observed in some animals, indicating that it may serve similar functions across different species, including dogs and cats.