What color am I?!

My horse Dusty is a sooty buckskin/dun he has a few markings on his legs but his dorsal stripe changes as far as level of darkness he's kind of like someone with hazel eyes always changing colors, some days it will be a dark chocolate to black color and others a lighter chocolate color.

So when you introduce him as 'this is my x qh dusty', what color do you say?
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LOL I've always just said dun course my husband calls him a mule it really depends on the weather and the time of year when its sunny out he has this yellowish color going but if its cloudy he has some yellow ticked chocolate to black thing going on if you don't know this you'd think he was two different horses.