I'll second this and I don't like heavy blankets.  The Bara Singha hide I use is super warm but heavy.  Unless it is real cold, I kick it off.  Not as large as a buffalo, but larger than a whitetail. 
You could also buy a beef hide.  I see them sold for area rugs.  Those are large.  Ikea had sheep fleece, but you'd have to sew a couple of those together.
@muddy75 do y'all tan the deer hides?  I've got a small collection and the kids are asking for them.  Dad uses his for throw blankets.  The trick is keeping the dogs from using them as chew toys.