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.
Usually when I see this behavior it means there is something going on inside the mouth such as a loose stool (or broken tooth), mass/tumor/polyp, foreign object trapped around or between teeth, or infection. Therefore, the best next step if she continues this today is to arrange for her to get an exam with her veterinarian today or tomorrow.
If she also has drooling and is not eating well then perhaps this could be a symptom of nausea. That can be related to an internal problem and not primary mouth issue such as organ problem (liver, kidney, pancreatitis), reaction to previcox (unlikely if has been on regularly for a while), and the list continues. If your vet finds nothing in the mouth (and I must say a good exam of the mouth/teeth may require sedation/anesthesia) then doing some screening lab work such as CBC, chemistry profile with electrolytes and urine check would be a very good starting point.
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