We've been having a bit of a problem with Chip lately. The other night, Chip was curled up on his dog bed (not in his crate) sleeping. My son (15) called Chip's name before reaching down to pet him. Chip lunged toward him snarling and snapping, etc. -- scared him (and me) half to death. This morning, again, he was curled up on his bed, but not sleeping. My wife was talking to him from a chair (he was looking at her, plain as day), then she moved closer to reach down and pet him. Again, he lashed out at her, but not as dramatically as with my son. This is a fairly recent behavior, although he has shown some signs of protective behavior (growling, showing teeth) when my wife and son were play fighting/wrestling near him.
Outside of leaving him alone when he's lying down, recommendations of how to curb this kind of behavior?
Banshee (Mesa Banshee)
Chip (El Aloha)
Tyson (Vision of Dodge, 12/9/03-5/21/10)