I was also wondering if the feces of ducks or chickens will harm dog/cats. I have 2 ducks, their pond is a small turtle (their choosing) and I dumping it nightly and fill it with fresh water in the morning. Both our cats and dogs drink out of it, as do my chickens.... Glad to hear it isnt going to kill them, It would be pretty hard to prevent them from doing so since my ducks and chickens hang with the cats and dogs...