"I suggested the storyline to (creator) Julian (Fellowes) about a year ago. I said, 'I know we're always fairly fudgy about time in our show, but even I can tell this dog who could have been three in series two is going to be getting on a bit now, and maybe there's something in that storyline?'" Downton Abbey star Hugh Bonneville admits it was his idea to axe his character Lord Grantham's beloved dog Isis on the most recent season of the hit drama.