Because raw dough containing leavening agents can cause great gastric distress for dogs (many times requiring expensive surgery), I phoned the Pet Emergency Center for advice. They told me to induce vomiting in the guilty dog. Vomiting is induced in dogs by feeding them Hydrogen Peroxide - 1 Tablespoon per 10 pounds of dog. That meant 1/4 cup for Dora and ~1/3 cup for Grace.
While I was pretty sure Dora was the guilty party, I couldn't take the chance. So I had to force feed about 2/3 cup of peroxide down two very uncooperative dogs, walk them around a bit to speed up the nausea and wait for the biscuit dough (and the dog food they'd eaten about 15 minutes before eating the dough) to reappear. It did...all bubbly and foamy from the peroxide...in my backyard, in the front yard, and (because of unwarranted optimism on my part that all was well) in my living room. Well, at least I had the incentive to scrub my carpets this evening!