I bought a filly a few years ago who was a dapple grey. The breeder sent me baby pictures of her and I was sure they were of a different foal. It looked just like your foal,solid chestnut or perhaps sorrel. She assured me it was her and even had pictures of her nursing. When she clipped her just before I bought her at 6 months,she was a dark dapple grey. Her Mom was dapple grey and her Dad was called a chocolate palomino He was a funny golden chocolate color with mane and tail just slightly lighter. I will see if I can find those pictures. The breeder told me that as she started shedding her foal coat,around her nose and eyes and on her legs showed the darker color first.