I know its a few days later but very commonly we have owners fast their pets or reintroduce food VERRRRRRRY SLOWLY because anesthesia makes them nauseous. Antibiotics and pain meds both (depending on the kind) can cause GI upset, more commonly associated with loose stool but vomiting could be seen with it as well.
As far as the breathing problems, they intubate the patient during dental to deliver gas/oxygen that maintains them and to also prevent water from the dental procedure being aspirated. Very very very commonly, the placement of that tube itself causes tracheal irritation, but it will typically go away within a few days with no treatment needed.
Just throwing these out there as general knowledge in case anyone experiences these symptoms!
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