My 7 year old grandson, Landon's Happy Chickens, are not so happy. Lost 5 more hens and his only rooster yesterday afternoon. 3 were left piled up by the American wire fence and other three were gone but feathers everywhere. The rooster and Dixie Rainbow both were heavy over 12 pounds each. They had bite marks on their necks but not eaten. We have had major problems with dogs but I didn't think a dog could jump the American wire fence. Any thoughts?