Bay and brown are variations of the same location of the gene that controls that expression. It limits the black to the edges/tips of the horse (mane, tail, tips of ears, muzzle, and legs. The body then is left some variation of red or brown. There are three ways for "bay" to express - as a wild variation where the black on the legs is well below the hocks and sometimes a cream strip of hair runs up the back of the leg and around the top of the black if it is at the pastern or as bay which gives the horse the red body and the other is a brown body which comes with cinnamon points on the muzzle and in the soft spots. This horse has the cinnamon coloring and would be brown. As dark as she is coming in seal brown.