Not to pile on, but Phipps is right on this one. At least from an Islamic perspective.
There is a barrier separating the dead from the living, called the barzak. None can pass it. The only way to leave this world is to meet the angel of death. When you can actually see him (as its said, he stares us in the face 5 times a day every day). At this point he takes your soul and you no longer have any contact with this realm.
I know it's hard to lose a loved one, even if it's a pet, but false hope doesn't help anyone. Look at all the people who worship a prophet. Is false hope helping them in the end? If it's any comfort, these people are not "dead". They are alive as you and me, just in another dimension.
Illyeen and Sijeen
Many people in this life have claimed NDE's, but this usually involves the devil. If not, then the person is insane, or simply lying.
I think I have mentioned some of these things already in this thread but idr. One thing is clear. This life is a test. Nothing more. Once we die, it ends and the grading of it begins.
Death is promised, and scripture is the reminder of our true destination. None can return.
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