I have to agree with Chris from a previous post. I have had the exact same results by treating my horse inexpensively for an ulcer with rantitidine. I followed the treatment outlined in an article by Dr. Kerry Ridgeway http://www.drkerryridgway.com/articles/article-ulcers.php I too used the slow feed hay bag and added alfalfa before his grain to buffer the stomach. For maintenance I use Jerimiah’s Ulcer Repulser daily.
I have owned this OTTB horse over 10 years and cannot believe how relaxed and happy he has become.