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This horse in particular. grin I’ve said it so often that people think I’m crazy, but in just a few hours of observation I walked away thinking Barbaro was probably the most eerily intelligent and professional horse I’ve ever seen.
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Coming from the owner of a similarly bred (albeit much older!) TB, HECK YES, it’s completely consistent with the horse’s personality to ask for (if not DEMAND) what he wants/needs. These guys are preternaturally bright. I think most of y’all know the story about Avery jumping out of his pasture, unlatching the back barn door, turning the ceiling fans on, opening a nice clean stall, going in, CLOSING the stall door, and lying down for a nap under the ceiling fans! 
When Avery was in hydrotherapy he used to nearly DRAG me to the swimming pool. He also throws his halter at you when he wants to go out and thinks you’re dawdling. Back when we were messing with therapeutic shoeing, if the new shoes were making him uncomfortable, Avery would simply lie down in his stall and use his back toes to wiggle the shoes off his fronts. 
I’ve got one vet who, when not sure what approach to try next with Avery’s RF, will more than semi-seriously ask me "What does Avery think?’ He always says it laughing, and admits he’d never ask that question to ANY other client, but we’ve all learned over the years to take Avery’s opinions very seriously indeed.
So yeah, Barbaro asking for the sling doesn’t surprise me one bit. That’s what these guys are like. :yes:
Hang in there, Barbaro.