Look up your Thoroughbred under his race name on Equibase.com you can get old race videos there if they were at a track that recorded them
Gwen sorry to hear that😢💖
Try going searching for “thoroughbred pedigree” and then searching for your horse’s racing name. You can find some info there like who his parents are then search for the stud where his parents stand and look at any sales or foals or anything from them. Ask the stud where he was born if they don’t have pics or ask the trainer or racing yard.
If he did well in racing then if you search eg. “Exemplar RSA 2013” (my horse) then you might be able to find news clippings or videos and pics of him too😍