National Pet Memorial Day is observed on September 10, 2017. Since humankind first domesticated animals, the death of a pet or an animal to which one has become emotionally bonded can be an intense loss, comparable with the death of a human loved one, or even greater depending on the individual.
The death can be felt more intensely when the owner has made a decision to end the pet's life through euthanasia. While there is strong evidence that animals can feel such loss for other animals, this article focuses on human feelings, when an animal is lost, dies or otherwise is departed. (With material from: Wikipedia)