"A wise man is never sure of anything."

Anyone who is interested in this sort of thing, or not, find a copy of the Tibeten Book of the Dead.

I've never had this experience with an animal, but I have with a human. My old friend, Marshall Dodge came to me in a dream two weeks after he was killed by a drunk driver. In life, he was very unhappy. I believe he was bi-polar, anyway, he told me not to grieve because he had found the peace that eluded him in life. I still miss him after 25 years, but I don't grieve. How could I?

He also appeared to two other mutual friends around the same time with a similar message.
At the time, I had never heard of the Tibeten book of the dead, but according to it a soul hangs around after death for up to two weeks before moving on.