Tink was found abandoned in a muddy field in Dorset in March.
The Shetland pony was discovered alone and without food or shelter.
Tink has now fully recovered and is being cared for at RSPCA Lockwood in Godalming in Surrey.
She is now the star of the charity's Stock the Sleigh campaign.
In the video, Tink plays a pony who delivers presents to other rescue animals, after wishing she could be a reindeer.
More than 10,000 vulnerable animals are expected to be taken in by the RSPCA over the winter months.
The charity hopes the video will promote kindness to animals during the Christmas period.
RSCPA Inspector, Jo Story, rescued Tink earlier this year.
She said: “It really makes the job worthwhile when you can see an animal really get a second chance at living life, and it’s even better that she will be helping other needy animals as the star of our Christmas video.”