Hee hee - Mack is just following good bulldog tradition. Dad's rocking chair - which was hand-built for HIS dad, has tooth-marks in it from Butchie, the bulldog Dad has when he was a boy (more than 50 years ago.) Butchie managed to gouge the hardwood of the maple so much that no sanding and staining would have removed it, without leaving the chair arm hazardously thin!