Originally Posted by OneFastHorse
A short back doesnt nec mean a "stronger" back. A horse with a longer back will have a harder time rounding and collecting than one with a shorter back. But, a super short back really isnt desirable either.
But, like I said..there are exceptions to everything. I know of some long backed horses that are 1D horses.
Well obviously there are exceptions, and too short a back isn't good either. However, the longer the back, the weaker it is. If a horse has a decently long back then it's harder for said horse to hold the riders weight, and they're more likely to have a sway. And at a younger age. Shorter backs also help the horse engage it's hind end more around the turn rather than swinging it out.