Dogs can get depressed too. Lonely dogs may also feel sad. The behaviors that indicate dog loneliness are closely related to depressive behaviors, like withdrawal and lethargy.
1.
Destructiveness
When dogs are left alone at home, they may find ways to entertain themselves, such as chewing on pillows, shoes, and remote controls.
2.
The way Play Games
Lonely dogs may lose interest in their favorite games.
3.
Sleep is different now.
Lonely dogs may sleep more than usual or sleep in strange places, such as a closet.
4.
Vocalization change
Dogs use their voice to communicate, and a lonely dog might bark, whine, or cry when left alone.