I feel that we come back... but not as something or someone else. We come back to watch over our loved ones, and to keep them out of danger.

I feel that animals don't have souls, (because they were not born with original sin, nor can the sin) they have spirits, so once they pass, they go to the bridge, leave their bodies there, then come back as another animal. Sometimes they come back as the same type of animal, dog, cat, bird... etc. But sometimes they don't!