Ha Ha That is evil. I have thought that as my butt is getting bigger, no doubt the horse looks smaller. When I was only 135lbs I thought some of the horses looked smaller. None of them were small horses. The smallest horse I ever rode regularly (other then when I was a tiny kid) was a 14.2 hand Arabian. Even though I weighed well under 120 lbs then, I felt way too big for that horse. I think a lot of that is in ones head. If the horse thinks you are too big, chances are they will show signs of it.