It is as big as a normal horse. And I think it would be used for its swifness rather than strength.
It could also have other breeds, like bigger stronger ones... And would be more sutable for carrying heavy loads. Hmm... I might draw some like that, with bigger shoulders and chest. Then it could carry Ynnwns and Kran, I\'m not too possitve a regular one could carry them.
I hope that answers your questions! And thanks for the comments.