Dispite their name, every horse gets a number and then you can look up its records.

There are many websites on the Internet that are created just for this purpose. For instance, bloodlines.net. Try tracing back to his sire/mare, and searching them, so you can indirectly learn about his background. Depending on whether it is Thoroughbred or Standardbred, you may need to try different sites. No horses go unregistered if they have raced, so an answer will most definitely come up in time.

call –newmarket 61321

I have to agree with bigliardi555. Just google equine bloodlines.

go to the english thoroughbred assoc.they usually have the breeding of horses going back several generations on their files, also they will give you links to check if some of the ancestors are from other countries, it;s a lot of fun