Gaelm has told you that you can exchange your Bree-horse for another.
'Greetings, I am Gaelm, son of Éogar.
'Have you chosen a horse for yourself instead of a pony? While Bree-horses are much more gentle than others, a horse would still not suit one of your stature. I can take your horse back and provide you with a pony instead, if you wish.
'I would ask that you be careful with your choice this time, though. My father already looks down on these Bree-steeds... I would not wish him to think those that ride them have addled wits.'
Gaelm is at the Hengstacer Farm, north of the Bree Festival Grounds.
Gaelm suggested that you take a moment to consider whether or not you want to exchange your horse. If you decided that you do want to exchange your horse, you should speak to Gaelm again.