I have a mini that is about 30in. I would not say they have health problems per say. The biggest problem we have had is that his teeth are to big for his mouth so sometimes he gets food compacted up in his cheek and I have to reach up and pull out the food. Teeth problems are not uncommon, other then that he has been healthy and I have had him 17 years. My kids have rode him around, and play with him but other then that he is more like the barn mascot. They are just as much care as a big horse, feet still need to be trimmed, shots given, teeth done, they just don't eat as much. And they get fat on nothing so you have to be careful what and how much you feed. 26in is pretty small I would not imagine she could be rode. But if your looking for a mascot then go for it.