RE: Lawn Mulch That Won't Kill My Dog?
From the experiences I've had with my weim, about the worst that will happen is they'll $#&t funny.
Case in point: My dog got a cut in his side that required stitches. While in the lobby of the vet's office he was still coming down off the anestetic. He decided he didn't feel so hot and vomited on the floor. Contents off stomach: grass clippings and a chuck of aluminim foil from god only knows where.
Ok, in all seriousness I'd check with your vet. Most organic ground covers (i.e., mulch) are treated with chemicals so the bugs won't eat on the so much. Whatever you use, if your dog $#&ts funny, try something else.