In one of Errol's movies!

Hi everybody – again I have been MIA for a while and noticed nobody has place a quiz question!?

Here is one for fun:
In one of Errol's movies there was a horse who had a nice name:
1. What was the name of the horse?
2. What was the race of the horse?
3. What was the horse able to do?
4. Who rode the horse – did Errol or another actor ride the horse?
5. What year did this horse have its movie debut?
6. Later this horse received another name – what was this name?
7. Who renamed the horse and why?

Happy quizzing – Saturday is answering time!
First entry with all the correct answers is the winner!

— Tina