I feed my dogs freezer burnt meat all the time with no ill effects. I usually feed it raw and frozen. I love it when my co-workers clean out their freezers. Freezer burnt meat is perfectly fine for humans to eat too--most people just don't because it doesn't look nice and the meat may be tougher than normal.

The only time my dogs smell bad is when they get too much caribou--for some reason caribou gives a few of them gas.