Can you help me track down a documentary I saw not long ago that discussed dressage horses?

I want to say it was a 60 Minutes documentary, because I always watch 60 minutes, without fail on Sundays.

However….it could be a Nature or Nova episode because I watch those without fail every Wednesday.

It mostly discussed white Friesian horses specifically, on this one particular breeding farm, although other kinds of horses can be dressage horses. It was filmed in England, I think.