Ah, I've heard this from my BO because we have a mare that does this. She is half TB and the BO says that some TBs have a gene or something that when light hits their eyes at a specific angle they toss their head just like in the video and how you are describing. Im sorry if im bad at explaining because I can't remember everything she said about it. And just to add, the mare at my barn that does this does it regardles of the situation, and does it when she's sorta dozing off and when she's being ridden. I can try and take a video lol
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Last edited by LouieThePalomino; 07-31-2013 at 06:58 PM.