This morning I caught Charlie (whose 5 months, 6lbs) eating a small square piece of leftover brownie... It was on a plate on the coffee table and of course, he found it! I called the vet and she said that since it wasnt a large quanity, he should be fine, but he may be lethargic or have
diarrhea today

... Has anyone else had something like this happen?! Anything else I should do?