Dog ate a chocolate chip

We are puppy sitting for our neighbors 2 year old mini Aussie doodle. I have no idea how much she weighs. Maybe 9-12lbs?? Anyways, a kid outside was eating a chocolate chip cookie and one of the chips fell and the dog ate it. Just one. Should I be concerned? No idea what type of chocolate it was, but for a homemade cookie I’m assuming semi-sweet.