I have a Jack Russell dog and every time he is outside, running around in the backyard, he runs straight over the the pond and starts attacking my pet fish. I have 4 small Shibunkin fish and I have had to put metal netting over the pond to protect them from my dog. But that hasn't stopped him walking on the netting and trying to bite and bark at them. What can I do to distract or train my dog to stay away from the fish? Thanks.