There have been many a timwe when my dog or cat has gotten sick afte reating something that i ate! And I freaked out...i think it is because they cannot digest human food properly! It i sprobably just the food not agreeing with him, or by coincidence your dog just got sick the same day he happened to eat yiour rice! I think if it was bad, it wouldn't even effect the dog th esame way, and if it did, you woul dhave also been sick at the same time...but I am pretty sure your fine