Thank you for your question regarding your Yorkie girl who has had ongoing diarrhea and vomiting since Saturday - the poor thing. It definitely sounds as though your girl has got a bad case of gastroenteritis. This is most likely due to something she ate and I commonly see these sorts of symptoms in dogs who have managed to get into the rubbish!! If this is ongoing and she has ongoing vomition, then I would be very concerned she could even have pancreatitis. If she is still quite sick tomorrow, get her back to the Vet for some blood tests.
If there are any more bouts of diarrhea tomorrow, then you should take her down to your Vet to get her checked and your Vet will decide whether there is a likely infectious cause or not and my give her an antibiotic injection or some Peptobismyl to help firm things up again. In the mean time, be sure to keep her well hydrated and feed her bland food for the next two days or so. You can either purchase some Hill's I/D from your local Vet or stick to dog biscuits only.
As I say the most likely cause for her symptoms is an acute gastroenteritis and this can commonly be caused by salmonella or campylobacter. If this diarrhea is ongoing, you should take a sample in an icecream container or something similar so that your Vet can send it to the lab for a fecal culture so that we know what is going on here. An obstruction is also possible if this is ongoing as your girl has had vomiting as well as diarrhea. For this reason also make sure you wash your hands after handling your girl!
Finally - yes it will be fine to give her something for the diarrhea and pepto bismyl or scourban is best for this. If you have some there you can give some as directed. If you don't have any you will have to get some from your Vet tomorrow as mentioned previously.
Best of luck with your girl and please keep me posted.
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Dr M D Edwards