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To help with the upset stomach, you can give an over the counter antacid. The one I use most frequently is Famotidine (Pepcid). The dose I use is 0.25 mg per lb body weight. It can be given every 12-24 hours, as needed.
I would also try feeding a canned food or bland diet of chicken/ rice over the next 2-3 days. Once eating normally, you can switch back to her normal diet.
I hope this helps, let me know if you have any other questions.
It's given orally. It comes in 10 and 20 mg tabs. You're probably going to give 1/2 of a 10 mg tab for a typical Sheltie.