Not sure what you want to know but for sure there are things you can learn about the mare. I think all you could learn from the stallion is if he is homozygous for black (EE) but maybe someone else can add other options. Unless of course there is ANY chance he could be LWO+?? What color are the mare's sire and dam? Or what color was she before she turned gray? We got our gray mare tested for LWO (her sire is a frame overo), EE, agouti, and silver. Ours happened to test positive for all of them and homozygous for black (EE), so genetically she is a silver bay frame overo, but looks gray. I don't think you need to test for that, but you should test her and/or the stallion for tobiano. Someone must be carrying pinto genes.