Saturday I moved my 4yr old back home after being at the trainers for 2 months. Saturday evening she did not eat her feed (I kind of blew it off at that point I figured she was settling back in) well she still does not want to eat her feed. Exact same feed she has been on at the trainers. I am already treating her for ulcers, She never had this problem before. I gave her a small amount of a different grain last night to see if she would eat that and she did. Any idea's what would make her just decide she does not like the feed she has been on for months?