If you had more than one dog and one passed away, it is important for you to realize that the dog left behind may go through a grieving process. Just as humans mourn the loss of an animal companion or a human loved one, there is a great deal of evidence showing that dogs go through a grieving process as well. Therefore, it is important for you to be aware of this fact and to take the steps necessary to help your grieving pet get through the loss as best as possible.