I'm in southwest Michigan if that matters.
They are large, about 2 inches long. Maybe a little more. Big bugs. They fly very quickly, have wings like a dragonfly. Their butts are big and yellow and black like a bee. And have the front end like a wasp. They are not furry that I am seeing, very smooth in appearance.
We have 3 dogs. No one has been stung that I've known of. We are trying to keep them away. These things have shown up in the past week or two. Haven't been here all season. Only since it got crazy hot. Looks like they nest in the ground.