I'm sorry, but the "Pepto" suggestion had me roaring! When Cody was a pup, and had an upset tummy, the vet said to use Pepto. Well, I bought the liquid. not the pills, and being a spunky little boy, let's just say I wound up with Pepto all over me, my hair and the floor. I never did get any into him, but thankfully he was OK the next day. I, on the other hand, had to take a nice hot shower!!!
Hope Maggie is better now and the other suggestions really work.