Some lonely cats will make a mess while youre gone and an anxious cat may even urinate outside of her litter box. They may become depressed and listless. This is not the case.
They know how to take good care of themselves. Your cat may all of sudden start behaving in an especially clingy and needy manner too. The owners distress at the loss of a pet may also be communicated to the cat adding to the confusion it may be feeling. They may sleep more than usual and move more slowly sulking around.