Ok, my best friend bought a broodmare about a year ago and she is 11 years old. We were told she had never been ridden due to the fact she foundered when she was 1yr old. To our knowledge she has never foundered since. Today I got on her and she rode like a dream, we rode for about an hour. My question is, is it ok to ride a horse that has foundered? We were talking about trying her on the trails after a little more riding experience. Any advice is greatly appreciated.