RooRoo is getting seriously long spurs

ETA: THANK YOU for your advice and help!!! We'll be going after him with dog nail clippers, followed up by a dremel, with a styptic pencil at hand. I'm expecting the living core to be about an inch and a half, and we'll work cautiously. Thank you on his behalf, too!!!

Long enough that he walks a bit funny trying to avoid slicing his ankles. They point about 45 degrees between straight at each other, and to the back. So, I need to trim them. Options are holding him and having them dremeled down to a reasonable length, or just cutting them with dog clippers. I would prefer to keep them sharp, he's taken on a hawk and those are usable weapons. I have never had to trim down spurs before, the other roosters didn't get them this long!

Any tips, advice, feedback, or good links would be appreciated. I'm not sure if the spurs even have a blood supply. I'm going to be going and googling but this is my first stop info shop :D