Like I said on the other thread, I believe that the worst predator to have is a bird of prey (owl, hawk, etc.). Most are protected species, so you can't really do anything about it. At least with the other predators you can take care of business.
It seems like dogs are running a close second to raccoons. When I was investigating getting some waterfowl for this year I was reading all I could on ducks and geese. One fact that kind of caught my attention was that geese can live 20+ years; however, their average life expectancy is 7 years due to dog attacks- not predator attacks, dog attacks. I found that to be interesting.
Good poll, Opa. I am curious to see the numbers at the end.