I am an eventer and had thought about breeding her to a TB to get a nice appendix. I have been looking for conformation and athleticism first. I have been looking at studs that are all taller then she is. Today, I met a very nice Westphale stallion, but he 16.3 hands. Had not really considered a warmblood, but he has all the qualities I am looking for and he is local (a plus for sure). But I am thinking he may be too big for her.
What would you say is the "rule" for how much bigger you can breed a mare to?