When dogs are sad, they usually show symptoms such as depression, loss of appetite, disinclination to activities, inattention to people, lethargy, and drooped ears. If a dog is sad because its owner has died or been mistreated by its owner, it may even choose to run away from home and not want to come back.
Owners should spend more time with their dogs. They can touch their dogs' heads and backs with their hands. To soothe the dog's mood, you can also feed the dog some snacks, or take out the dog's favorite toys to divert the dog's attention.