Urgent

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Ok, didn't go to the vet and apparently it was gas, because her tummy shrank back to normal after getting a bit of Dog Smog (it's got natural anti-gas stuff), one more small bout of diarrhea, which was normal (for diarrhea) and was her usual self today. Good appetite, bouncy like usual.

The owners have been informed of what happened last night in case they think she's acting different at home and want to take her. She may have just played too hard; she had her first day out with the big dogs yesterday because she was terrorizing the little ones.

Thanks for all the replies though!