Chance

Chance is one of Lou's Dude Ranch horses.

Amy worked a clinic and a strange lady showed up at the end of the clinic looking for help with her horse. Amy works with him and finds out that he is always kept in a stall and lets Georgie try join up. She quickly develops a bond with him and gets him to join up. The lady is in awe and asks if she can take him to heartland for Amy to work with him more, however when she goes to get the trailer they discover she's disappeared.

A year later we see Chance at the dude ranch and Amy tells Mackenzie Hutton that he's now one of the most gentle horses on the property.