Imagine this scenario. You have passed away leaving your beloved pet behind with no one else in the home. What happens if you are not discovered right away, they could go without food or water.
Grief is not an emotion that is reserved for humans. Animals grieve the passing of one of their own and even the passing of a human. So, when there is a loss in a home, animals feel it too. It could be another dog or cat that was part of their pack.