not sweating when you're supposed to is a sign of heat stress, or more seriously, heat stroke-which is deadly.  i would imagine it would be the same in horses as it is in humans. 
i saw them laying whole ice bags on some of the horses backs when they were walking from the track back to the barns.   
 
i just think a combo of things affected big brown, and in total, was way too much for him to overcome.  they may never find a reason why-as they're looking for one big thing, and i think it was many little things ( or maybe not so little) combined that kept him from the win. 
		
	
		
		
		
		
		
		
			
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				Books serve to show a man that those original thoughts of his aren't very new at all.  
Abraham Lincoln
			 
		
		
		
		
		
		
	
		
		
	
	
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