Join Date: Mar 2006
Location: Beautiful Pacific NW
If you're up and about, he probably doesn't do it, right?
Dogs sense when you're "vulnerable" (lying in bed) vs. up, clothed, etc.
To dogs, the sleeping place is the "innermost sanctum", so your bedroom is the "must protect" zone. That's the den, and if you're sleeping they feel they must protect you at that point.
Don't set the dog up for failure to bite someone, as others mentioned, tether or crate him so he's not free to go bite anyone. Don't have your room mates coming into your room, either.
Our Dachshunds that sleep with the kids, would bite someone if they harassed one of my kids while that kid was lying down and/or sleeping in the bed. Any other time, they don't really care, but if the child is sleeping on the bed, you can't really get close to even shake said child awake, without removing the dog off the bed.
The GSD tends to be the same way. He doesn't mind us coming and going in the house but if his girl (my 17yr. old daughter) is in bed, he's much more protective of her.