So its been a long winter and my mare is well fat we know she's not pregnant, and she's a grain guzzler. But her stomach is huge like 2x the size of a regular horses tummy. Just the other day I rode her and she couldn't go faster than a fast walk, so I used a crop for a couple rings. She responded but she was scared so I tried again with out crop and still couldn't do it. So is it because she's fat or because of something else. Btw she's about 5 yrs.