Horseland (2006)

After Pepper is injured during a competition, Zoey turns her back on her and starts avoiding her after hearing about a horse having to be put down after it is injured. Pepper becomes depressed and unmotivated to get better and ride again when Zoey stops coming by to see her, which only adds to Zoey's fears about losing her. Zoey then gets a new horse to ride, because she thought Pepper was goig to die. It's up to the rest of the Horseland gang to reunite both Zoey and Pepper before the two give up on each other, and their lives at Horseland, for good.