You two just brought up an interesting point...the brown or bay thing. I never thought of that before. I thought since he had the black mane, tail, and legs that he's a bay. What's a brown? What's a dark bay? What's my horse?
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I was really confused too. I had always thought brown was always "seal brown" (black/really dark with light muzzle, flanks, etc). They can actually range in shades
Bay and brown are both agouti genes, restricting the black pigment of the horse in different ways. Bay is A, brown is At (bay is dominant over brown, so an AAt horse is bay that can potentially throw brown).
A bay horse will stay generally the same color throughout the year. Shades can range from light to dark, but they will not have the lighter muzzle/flanks/thighs. Always have their black points.
Browns are variable as well. "Seal" browns, such as one mare at the farm I work at are very dark with obvious mealing of the soft body parts. Lighter browns, such as my horse, can
basically chameleon as bay during the summer and show the signs of brown in winter (darker coat, mealing). Reno only lightens up in the muzzle area. Others will look bay all year round, except for the light fleshy parts.
I'm terrible at explaining.