Keep an eye on it
What it can look like. A general, vet-reviewed example — signs vary and this is not a diagnosis. When in doubt, ask your vet. 
Vomiting in dogs
Clinical name: Emesis
Intermittent vomiting, sometimes after meals.
Where it shows upnone
Typical patternN/A.
Linked allergy typesFood allergy
Food vs environmentalGI signs lean strongly toward food.
What you can do
Note timing vs meals; persistent or bloody vomiting needs a prompt vet visit.
Don't confuse it with
Other causes a vet will want to rule out: dietary indiscretion, infection, other GI disease.
This is educational information, not a diagnosis or treatment plan. Always see your veterinarian about your dog's health.
Related signs
Diarrhea / loose stoolKeep an eye on it
Soft or loose stools, sometimes more often than usual.
More frequent stoolsTrack it
Going more than three times a day, sometimes with urgency.
Gas & gut noiseTrack it
Excess gas and audible gut gurgling.
Dull coat despite eating wellKeep an eye on it
A dull, poor coat or weight despite a normal appetite.