What's the difference? I'm getting a weanling this fall, and while visiting the farm where she comes from, there was general talk around the family that she could be a blood bay? I guess I've never heard that term. I assumed (incorrectly it seems) that there was only one color "bay".
Here is a picture of the new little gal. Her mama is a dun and her daddy is a buckskin. That's her mama in the background.