Wow, sorry to hear of everyone's losses. We have raccoons here but they've never gotten into my pond. They go into the garage through the cat door, and rummage through our recycling bin in our back porch, but for some reason don't bother the pond. One night I took our dog out on a leash to do her business before bed, and a raccoon came running around the corner of the house and nearly ran into us. I do have a large net a few inches above the pond, could that deter them?
Herons though, they are a problem. One was visiting the pond yesterday morning and we scared it away. Since I put the net over it they haven't figured out how to get the fish, though.