Dogs in general this day and time are being trained NOT to attack or go after the owners chickens and other animals, you can read this alot in this section of the forum as you well know. Yet many dogs do possess the natural instinct to do so anyway, you see that too in this section or the emergency section with resulting injuries and death to the owners chickens. OP only stated his dogs were outside and wants geese to deter the fox, doesnt want the fox killed...wants his cake and eat it too. What does that tell you?