My 3 month old puppy got her second distemper booster yesterday afternoon. She also got her second heartworm preventative (interceptor) and frontline plus application yesterday evening. During the night she started having episodes of watery diarrhea which is continuing today. She is eating and drinking normally. She seems to have a bit less energy than normal, but she is still playing. Could this be a reaction to the distemper shot? Or is it more likely that she ate something that upset her tummy?