Minis like all beings have different shapes. Your mini may always have a belly that seems like it's lower or bigger than other minis you see on this site, but it doesn't necessarily mean she's fat. Some of the minis represented on this forum are perfect little miniature horses, but do not represent what all minis look like. As I’ve mentioned, my boy Rocky and my previous horse Lady have a body shape like Rosie’s. My boy Cooper looks less like Rocky and more like what people think all minis look, but not quite as slender. I’m attaching a couple of photos showing their shapes are different, not the best photos, but I think you can see that they have different body types. Rocky could probably lose a couple of pounds, but he’s not obese. The vet says that their weights are both fine it’s just that they are totally different body types. Rocky is little and red, Cooper is bigger (38”) and a blue roan. If I find a photo of Lady to attach, she was also 34” and had the body shape of Rosie.