Thanks for the answers to my questions.
Several thoughts come to mind as to why she might be coughing since it's been such a short period of time and she doesn't appear to be otherwise ill.
1. Kennel cough or tracheobronchitis is probably the most common cause for coughing in an otherwise healthy dog. This condition is either secondary to a viral or bacterial infection and can be contagious between dogs . If a bacterial infection, then these dogs respond to oral antibiotics pretty quickly.
But if this is a virus , then it will have to run it's course....which is usually between 10-14 days. Kennel cough gets worse before it gets better and gradually improves rather than abruptly stopping unless this is a bacterial infection and antibiotics are started.
2.Ingestion of objects such as sticks or rawhide, grass, or anything that could cause damage to the back of the throat when ingested can cause coughing.If this is the problem, then it should resolve pretty quickly…usually within just a few days once the offending material is no longer ingested.
I recommend a diet of soft or moistened food (avoid dry kibble) so that further damage/irritation is avoided.
3. There are a number of other possible causes including problems with the heart/lungs or Canine Influenza or bronchitis or pneumonia which I'll include to be complete but aren't as likely since she's not showing other signs (such as a nasal discharge) and she's not been coughing for a while.
As to over the counter treatment options, cough suppressants can be given although I'm often hesitant to use them if kennel cough is the problem. I want those secretions removed from the upper airways and I rarely want to inhibit this reflex.
But acceptable ones to use include Dextromethorphan (LINK).
The dose would be 0.25 to 1 mg/lb 2-3 times a day. You just want to double check labels and ensure that the formulations only contain this ingredient although inclusion of Guaifensin is fine.
Anti-histamines are also safe to give which can help dry up secretions similar to a human. The dose of Benadryl, for example, would be 1 mg/lb twice a day with sedation a common side effect.
I hope this helps and that she's feeling better soon. Deb