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Is her abdomen distended or hard feeling at all? Is she acting restless?
Also, how long has this been going on?
Thank you for the additional information. I would recommend a visit to your veterinarian since this has been going on for this long already. My first concern was bloat, which is still possible, but not as likely if her symptoms haven't worsened in that time. She could be suffering from nausea, something stuck in her throat, kennel cough, or other less common culprits. Dogs don't always have every symptom of these problems, but may just show a couple. Without an exam there is no way to know for sure what it is. If you have further questions let me know.
I also wanted to mention, that one drug typically used for nausea is famotadine (pepcid). Dogs are usually given 0.25mg per pound of body weight twice daily. If you wanted to try this first to see if it helps you could, and then go to your vet later in the day if there is no improvement or if her symptoms worsen or change.