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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
It sounds like she may just have a GI infection or Gastroenteritis. This is a common cause of vomiting +/- diarrhea in dogs.
I would treat her with some sub Q fluids under the skin, an anti-nausea med (Cerenia) and some antibiotics (Metronidazole).
If you want to try an antacid at home to settle the stomach, you can give Famotidine (Pepcid)- 10 mg every 12-24 hours, as needed. It does sound like she'll need more aggressive care, but that's something you can try at home.
I hope this helps, let me know if you have any other questions.
No, Pepcid is a tablet. It's an antacid. Pepto is a coating medication and more for diarrhea than vomiting.
I'd give the pepcid now and fast her (no food/ water) for 6-8 hours. At that time, offer some food/ water. If she doesn't eat or continues vomiting, then I would go to an ER vet. If she eats and keeps it down, then I would wait until Monday to get her seen.
You're very welcome.