Our german shepard pick a frog up in his mouth, I guess the frog released a juice of some kind, it made our dog very sick he repeatedly threw up at least a good 5 min's. The vet said they did not know of any frogs that was poisons and to just make sure he had plenty of fresh water. It didn't take to very long and he was up and running around. He hasn't picked up any more frogs with his mouth either. He remembers how sick it made him I'm sure.