Here's how they did it:
* Live horses: A few different breeds were used for live-action shots, including Andalusian horses for their graceful appearance and American Quarter Horses for their strength and agility.
* Computer-generated imagery (CGI): The majority of Saphira's appearance was created using CGI, allowing for a fantastical, dragon-like look.
* Puppetry: For close-up shots of Saphira's head and face, they used a large-scale puppet to create realistic expressions.
So, while you can see some real horse breeds in the film, the iconic blue dragon Saphira is primarily a creation of CGI.