I never let my dogs near the duckling if I am not holding him or if he is not out of the dogs reach. One of my dogs I will never trust with a small animal, but the other one, Finny (hence my username) could not have a care in the world about small critters. I was holding the duckling and Finny came over and started sniffing the duckling. The duckling did not like that apparently, so his neck started vibrating and then he pecked Finny on the nose. Finny just ran away. The duckling never instigates anything. I am almost positive the neck vibration means "I am about to peck" now. Thank you all for your input!