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Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
I am so sorry your dog is experiencing this. Unfortunately her signs are vague and I am not sure I could pinpoint the exact problem - it could range from ingestion of unusual item to organ issue (liver, kidney) to pancreatitis to infection (viral, bacterial, fungal) and the list continues.
The best thing you can do until morning is to keep her water available and encourage her to drink to keep up her hydration. Because she is nauseated if you have Pepcid AC (famotidine) then you could administer this. The dose depends on her weight; let me know how much she weighs. It can help settle her stomach a bit. If you have peptobismol liquid you may give 1 cc (1ml = 1 cc) which will not hurt and might help.