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Your dog may have had some stomach upset from something that he ate. He might also have had a touch of pancreatitis.
I would keep a close eye on it for the next few days because what you are describing is also a symptom of parvo. If your dog had a milk case of parvo, you want to take special care.
If this happens again, you will want to see the vet for a fecal exam to rule out a parasite problem.
Let me know if you have more questions.