Yep, well mine eat the whole thing.
Talking to the osteospecialist today and he thought rawhide would certainly carry protein calories. So I worked out (and this is based on human metabolism of calories) - 1gm of protein = 4 calories & 1gm fat = 9 cal. Venison ear is about 37gm and 96% fat free. So that adds up to 155calories per ear. Whoops.