My horse has never been unsound. He's a 11 year old Hollsteiner and He's always been sound to my knowledge. I've had him sense he was 6. Just last week he came up lame but only under saddle and going clockwise. Lunging and straight away you can hardly see it. I'm having Chiro out, I just got a new saddle though. Anyone think it's the saddle? Why would be only one side?