Other pets are likely to feel the loss of the deceased friend as well. Even if they weren’t the best of friends the companionship is a comfort that is missed. Often, a surviving pet does not understand what has happened, so adjusting may be uneventful. If possible, allowing your pet to sit beside the deceased animal can help him or her understand what has occurred. When pets are aware of the loss, you may notice signs of mourning: A change in appetite Restless sleep Less playful or more restlessness Whimpering or howling